CN1667720A - Driving device for optical pick-up device - Google Patents
Driving device for optical pick-up device Download PDFInfo
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- CN1667720A CN1667720A CN 200410016910 CN200410016910A CN1667720A CN 1667720 A CN1667720 A CN 1667720A CN 200410016910 CN200410016910 CN 200410016910 CN 200410016910 A CN200410016910 A CN 200410016910A CN 1667720 A CN1667720 A CN 1667720A
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Abstract
The invention relates to an drive apparatus for optical pick-up, comprising an object lens; an lens holder to install object lens and iris servo coils, tracing servo coils, an tilt adjust coils, which is for tracing the data trail of discs; forming magnetic field parts, which includes magnetic iron, applied to the lens holder, for carrying out operations of tracing servo, concentrating servo and tilting adjustment, magnetic yoke and elastic joining parts connected to said lens holder, where the four angers on the surface of the lens holder, located an tilt adjust coil supporter to bear the tilt adjust coils integral separately, which is containing the first tilt coil supporter and the second tilt coil supporter, each positioned on a tilt adjust coil.
Description
(1) technical field
The invention relates to the light picker drive unit, refer in particular to about making a kind of price cheaplyer, and guarantee the light picker drive unit of three shaft-driven light pickers of high tilt tolerance.
(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 is will the thing lens be installed on the lens support with drive unit, and the upper and lower, left and right direction moves the said lens support, carries out above-mentioned focusing operation to the thing lens/tracking operation.Carry out the upper and lower, left and right direction and move in order to drive the said lens support, in magnet and the common magnetic field space that constitutes of yoke, focusing coil and tracking coil are set.According to the Fu Laiming lefft-hand rule, utilize Lorentz force to come mobile said lens support.
In order can be applied in the middle of the small portable massaging devices such as notebook computer, light picker is towards miniaturization, the trend development of ultra-thinization.Drive unit is to be divided into movable member and fixed part substantially, and it is fixed on the movable member by the material that is connected with intensity and damping behavior, makes it have the characteristic of required frequency.
Here, movable member need carry out resonance motion, does not produce unnecessary vibrations such as orthogonal two axial rotations of focus servo and tracking servo direction and inclination, follows the trail of the center of the signal trajectory of CD.
As mentioned above, generally, light picker is to use two axial brake devices with drive unit, and this device is along with the data track that forms on the CD, carry out left and right mobile tracking servo operation and upper and lower mobile, hot spot is shone focusing operation on the optical disc data track the thing lens.
But, because stain of the mechanicalness flaw on the optical disc surface and CD run the influence from (run out), its surface is not a homogeneous, so even carried out focus servo operation and tracking servo operation, the problem on the data track can occur accurately hot spot being gathered yet.In order to improve the problems referred to above, just bring into use triaxial driving apparatus, this is a kind of pitch drives mode that above-mentioned drive unit is tilted to certain orientation.
In order to make video disc recording/broadcast more data, the capacity of CD is just at high capacity, so the data track that forms on the CD is also in densification.
Along with the densification of CD, also should diminish by the diameter that is installed in the hot spot that the thing lens are formed on the drive unit, for this reason, just need short wavelength's laser and large aperture (numerical aperture) 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 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 (N.A.).
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.
Fig. 1 is the structural drawing of existing light picker with triaxial driving apparatus.
As shown in Figure 1, existing light picker comprises with drive unit: to thing lens 3, be refracted into the laser that is mapped to CD, form hot spot then; Lens carrier 1 is used for installing above-mentioned to thing lens 3, and upper and lower, left and right are moved above-mentioned to thing lens 3; Focus servo coil 7 is a benchmark with the center of above-mentioned lens carrier 1, is arranged on both sides; Tracking servo coils 5 is arranged on above-mentioned focus servo coil 7, and the direction of its direction of winding and 7 coilings of above-mentioned focus servo coil is orthogonal; Magnet 10 and yoke 11 apart from said lens support 1 certain distance, and are separately positioned on relative position; Brandreth 9, one sides are connected on the pcb board 12 of said lens support 1 two sides connection, and an other side is affixed on the damper portion 13.
In addition,, tilt coil is set, is used for carrying out tilt operation in the regional bottom that above-mentioned focus servo coil 7 is set though clearly do not illustrate.
Fig. 2 is provided with the side schematic view of structure for the coil of three driving drive of optical picker in the middle of the prior art.
As shown in Figure 2, lens carrier 1 side is a benchmark with the center of above-mentioned lens carrier 1, is divided into two parts, and focus servo coil 7 is set in both sides respectively.On above-mentioned focus servo coil 7, tracking servo coils 5 is set.In the lower end, both sides that above-mentioned focus servo coil 7 is set tilt coil 8 is set respectively.
The direction of winding of the direction of winding of above-mentioned tracking servo coils 5 and above-mentioned focus servo coil 7 and tilt coil 8 is orthogonal, and overlapping being arranged on above-mentioned focus servo coil 7 and the tilt coil 8.
Below, will the operation of above-mentioned Fig. 1 and the described drive of optical picker of Fig. 2 be described.
For can record/read data of optical disk, the laser diode emitted laser incides above-mentioned to thing lens 3, the above-mentioned laser that thing lens 3 are injected forms hot spot.For the focus with the above-mentioned hot spot that thing lens 3 are formed shines on the track that forms on the CD accurately, to the above-mentioned brandreth 9 guiding control signals of fixed lens support 1, will be above-mentioned left and right or upper and lower mobile to thing lens 3.
In addition, triaxial driving apparatus, parallels said lens support 1 under the uneven situation of height that (run out) or mechanicalness flaw cause in the race of above-mentioned CD with CD, carry out tilt operation then, the focus of hot spot is accurately shone on the data track.
Like this, the tracking servo operation of left and right mobile said lens 1 and the focus servo operation of upper and lower mobile said lens 1, and be under the effect of the magnet 10 of the both sides that are arranged at said lens support 1, to form under the state in magnetic field with the tilt operation that said lens support 1 tilts towards certain orientation,, tracking servo servo by above-mentioned brandreth 9 collectiong focusings and oblique servo signal obtain according to the Fu Laiming lefft-hand rule that Lorentz force realizes.
But, have the triaxial driving apparatus of said structure, tilt coil is set in order to carry out pitch drives being provided with on certain zone of focus servo coil, thereby has reduced the space that is used to be provided with focus servo coil, thereby caused the low of driveability.
Simultaneously, the coiling quantity of oblique servo coil also can reduce, thereby is difficult to guarantee tilt tolerance.
In addition, in order to make ultrathin drive of optical picker, use the PCB manufacture, when the novel drive coil device technology (fine patterncoil) of use tracking servo coils, focus servo coil and oblique servo coil is carried out three drivings, the technology of not only making different mutually next-generation drive coils is very complicated, and after the next-generation drive coil that making is obtained was installed on the lens carrier, power supply connected also very complicated.
(3) summary of the invention
The present invention carries out in order to address the above problem, the object of the present invention is to provide a kind of drive of optical picker, make the lens carrier of triaxial driving apparatus obtain higher tilt tolerance, electrical connection between simple realization tracking servo control signal, focus servo control signal and the oblique servo control signal possesses stable drive characteristic simultaneously.
To achieve these goals, a kind of drive of optical picker of the present invention includes: to the thing lens, be refracted into the laser that is mapped to CD and form hot spot then; Lens carrier is used for installing described to the thing lens, and focus servo coil, tracking servo coils, tilt adjustments coil is installed, and is used for described optical disc data track is followed the tracks of; Form the parts in magnetic field, be used for realizing magnet and the yoke of tracking servo operation, focus servo operation and tilt adjustments operation of described lens carrier and the elastic connecting element that is connected described lens carrier, it is characterized in that:
Be equipped with on four angles, surface of described lens carrier to the thing lens, be respectively arranged with the tilt coil support sector of the tilt adjustments coil of supporting one, each tilt coil support sector comprises: the 1st tilt coil support sector and the 2nd tilt coil support sector, described tilt adjustments coil is arranged in described each tilt coil support sector.
The 1st tilt coil support sector and the 2nd tilt coil of described tilt coil support sector are that support sector protrudes in certain distance on the said lens rack surface, and the width of above-mentioned the 1st tilt coil support sector and the 2nd tilt coil support sector is different mutually.
Simultaneously, described the 1st tilt coil support sector is provided with along the edge of described lens carrier, constituting between the 1st tilt coil support sector of described tilt coil connecting portion and the 2nd tilt coil support sector has certain distance, and the width of described the 1st tilt coil support sector is bigger than the 2nd tilt coil support sector.
Use the present invention, just can be under the situation of not using next-generation drive Coil technique (fine pattern coil), manufacturing can realize three shaft-driven ultrathin drive units, and the connection of power supply becomes simply, and can access high tilt tolerance (tilt margin).
Effect of the present invention:
The tilt coil that uses in the triaxial driving apparatus of the present invention that has above-mentioned formation and operate as mentioned above is arranged on four tilt coil holding componentss on the lens carrier, thereby can widen the scope of tilt tolerance, optimizes drive characteristic.
Simultaneously, still use the coil of existing winding mode setting to carry out pitch drives, therefore can reduce manufacturing cost, and can realize simple electrical connection.
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 is the structural plan figure of existing light picker with triaxial driving apparatus;
Fig. 2 is provided with the side schematic view of state with the coil of triaxial driving apparatus for existing light picker;
Fig. 3 is the structural plan figure of light picker of the present invention with triaxial driving apparatus;
Fig. 4 is provided with the side schematic view of state with the coil of triaxial driving apparatus for light picker of the present invention;
Fig. 5 a, 5b, 5c are three driving operation instructions figure that drive optical Pickup device of the present invention.
The symbol description of major part in the accompanying drawing:
21, lens carrier 23 is to the thing lens
25, tracking servo coils 27, focus servo coil
28, tilt adjustments coil 30, magnet
31, yoke 35, tilt coil support sector
35a, the 1st 35b of tilt coil support sector, the 2nd tilt coil support sector
(5) embodiment
Below with reference to accompanying drawings, the embodiment to a kind of drive of optical picker of the present invention is elaborated.
Fig. 3 is three structural plan figure that drive drive of optical picker of the present invention.
As shown in Figure 3, three driving drive of optical picker of the present invention comprise: to thing lens 23, be refracted into the laser that is mapped to CD, form hot spot then; Lens carrier 21 is used for installing above-mentioned to thing lens 23, and it is above-mentioned to thing lens 23 to move up and down; Focus servo coil 27 is wrapped in the 21 edge settings of said lens support; Tracking servo coils 25 is arranged on the above-mentioned focus servo coil 27; Tilt adjustments coil 28 is arranged on said lens support 21 on surperficial four jiaos; Form magnetic field components, be used for realizing the magnet 30 and the yoke 31 of tracking servo operation, focus servo operation and the tilt adjustments operation of described lens carrier 21, be arranged on the both sides of said lens support 21, spaced apart; And the elastic connecting element (not shown, can referring to brandreth among Fig. 19 and damper portion 13) that connects described lens carrier 21 at this.
Above-mentioned tilt adjustments coil 28 is separately positioned in said lens support 21 each tilt coil support sector 35 on surperficial four jiaos, the height of above-mentioned tilt coil support sector 35 is identical, but the width of the 1st 35a of tilt coil support sector that comprises is bigger than the 2nd 35b of tilt coil support sector, and spaced apart between the two.
Above-mentioned the 1st 35a of tilt coil support sector and the 2nd 35b of tilt coil support sector protrude in certain distance on the said lens rack surface, twine the 1st 35a of tilt coil support sector and these two holding componentss of the 2nd 35b of tilt coil support sector, above-mentioned tilt adjustments coil 28 is set.
The character of the tilt coil 28 that is provided with in above-mentioned each tilt coil support sector 35 is: the width of the 1st 35a of tilt coil support sector is bigger than the 2nd 35b of tilt coil support sector, so have certain inclination from the wind the line form of coil of the 2nd 35b of tilt coil support sector of the 1st 35a of tilt coil support sector.
And above-mentioned tilt coil support sector 35 is arranged on four jiaos of said lens support 21, the 2nd 35b of tilt coil support sector with to the 23 adjacent settings of thing lens.Because be provided with tilt adjustments coil 28 in above-mentioned four tilt coil support sectors 35, thus tilt tolerance can be improved during pitch drives, thus can realize stabilized driving.
Fig. 4 is provided with texture edge figure for three coils that drive drive of optical picker of the present invention.
As shown in Figure 4, around lens carrier 21, focus servo coil 27 is set.On the above-mentioned focus servo coil 27 tracking servo coils 25 is set respectively.In addition, tilt adjustments coil 28 is arranged in the tilt coil support sector 35 on the said lens support 21.
Above-mentioned tracking servo coils 25 with the zone of above-mentioned focus servo coil 27 overlapping settings, the direction of winding of its direction of winding and above-mentioned focus servo coil 27 is vertical mutually.The direction of winding of above-mentioned tilt adjustments coil 28 then is parallel to each other with the direction of winding of above-mentioned focus servo coil 27.
Three in the middle of the prior art drive drive of optical picker when tilt coil is set, be used for being provided with on certain zone of focus servo coil though be arranged on, but in the middle of the present invention, the tilt coil holding components is arranged on the said lens support, therefore can guarantee independently space, and then the tilt adjustments coil is set.
Therefore, can when using the drive unit of the coil of having used existing winding mode equally, realize three drivings, simultaneously,, can improve tilt tolerance on the lens carrier surface because 4 tilt coils are set.
Fig. 5 a to 5c is three driving operation instructions figure that drive drive of optical picker of the present invention.
Shown in Fig. 5 a, magnet spaced apart with lens carrier and that be oppositely arranged produces the words in magnetic field, just import tracking servo signal by the brandreth of supporting the said lens support, the tracking servo coils that is provided with on the focus servo coil support of above-mentioned lens carrier imports the words of tracking servo signal, according to Fleming's lefft-hand rule, will obtain certain power, carry out the tracking servo operation.
As shown in the figure, during perpendicular to the ground the injecting in magnet produces magnetic field, above-mentioned tracking servo coils receives the tracking servo signal that flows to the bottom, according to Fleming's lefft-hand rule, will produce power to the right.
On the contrary, above-mentioned tracking servo coils receives the tracking servo signal that flows to top, according to Fleming's lefft-hand rule, will produce power (not shown) left.
Shown in Fig. 5 b, if magnetic direction and ground that magnet produces are perpendicular, according to Fleming's lefft-hand rule, the focus servo coil that is provided with around the said lens bracket edge will produce power upwards.
Like this, the said lens support will rise, thereby can aim at the focus of the hot spot that the thing lens are produced.
On the contrary, just can import reciprocal electric current,, will produce downward power, reduce said lens support (not shown) according to Fleming's lefft-hand rule to above-mentioned focus servo coil.
Shown in Fig. 5 c, the tilt adjustments coil on the tilt coil holding components that is arranged on the lens carrier imports the pitch drives electric current of different directions, and the said lens support will have certain degree of tilt.
And, as shown in the figure,, also be provided with two tilt adjustments coils on the relative other side though have only two tilt coils, such one has four tilt adjustments coils carries out tilt operation.
As shown in the figure, when the magnetic direction that magnet forms was perpendicular to the ground, the electric current that imports in the tilt coil of She Zhiing was a right direction to the left, and according to Fleming's lefft-hand rule, the tilt coil that is arranged on above-mentioned left side obtains power up.Same method, the electric current that imports in the tilt coil of She Zhiing is a left direction to the right, according to Fleming's lefft-hand rule, the tilt coil that is arranged on above-mentioned right side obtains power down, thereby the said lens support will form certain degree of tilt.
Therefore, the present invention uses the method for winding of existing tracking servo coils and focus servo coil that tilt coil is set on lens carrier, thereby can reduce the cost of triaxial driving apparatus.
And, four tilt coils are set on the said lens support, thereby can widen the scope of tilt tolerance, optimize drive characteristic.
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 drive of optical picker includes: to the thing lens, be refracted into the laser that is mapped to CD and form hot spot then; Lens carrier is used for installing described to the thing lens, and focus servo coil, tracking servo coils, tilt adjustments coil is installed, and is used for described optical disc data track is followed the tracks of; Form magnetic field components, be used for realizing magnet and the yoke of tracking servo operation, focus servo operation and tilt adjustments operation of described lens carrier and the elastic connecting element that is connected described lens carrier, it is characterized in that:
Be respectively arranged with the tilt coil support sector that supports to the tilt adjustments coil of one on described four angles, lens carrier surface that are equipped with the thing lens, each tilt coil support sector comprises: the 1st tilt coil support sector and the 2nd tilt coil support sector, described tilt adjustments coil is arranged in described each tilt coil support sector.
2, drive of optical picker as claimed in claim 1 is characterized in that:
The 1st tilt coil support sector and the 2nd tilt coil support sector of described tilt coil support sector protrude in certain distance on the described lens carrier surface.
3, drive of optical picker as claimed in claim 1 is characterized in that:
The width of described the 1st tilt coil support sector and the 2nd tilt coil support sector is different mutually.
4, drive of optical picker as claimed in claim 1 is characterized in that:
Described the 1st tilt coil support sector is provided with along the edge of described lens carrier.
5, drive of optical picker as claimed in claim 1 is characterized in that:
Between the 1st tilt coil support sector of described tilt coil connecting portion and the 2nd tilt coil support sector certain distance is arranged.
6, drive of optical picker as claimed in claim 1 is characterized in that:
The width of described the 1st tilt coil support sector is bigger than the 2nd tilt coil support sector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410016910 CN1667720A (en) | 2004-03-12 | 2004-03-12 | Driving device for optical pick-up device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410016910 CN1667720A (en) | 2004-03-12 | 2004-03-12 | Driving device for optical pick-up device |
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| Publication Number | Publication Date |
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| CN1667720A true CN1667720A (en) | 2005-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410016910 Pending CN1667720A (en) | 2004-03-12 | 2004-03-12 | Driving device for optical pick-up device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419875C (en) * | 2005-09-29 | 2008-09-17 | 上海乐金广电电子有限公司 | Switcher of optical pickup excitor |
-
2004
- 2004-03-12 CN CN 200410016910 patent/CN1667720A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419875C (en) * | 2005-09-29 | 2008-09-17 | 上海乐金广电电子有限公司 | Switcher of optical pickup excitor |
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