CN1667718A - Alignment driving device - Google Patents
Alignment driving device Download PDFInfo
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- CN1667718A CN1667718A CN 200410016912 CN200410016912A CN1667718A CN 1667718 A CN1667718 A CN 1667718A CN 200410016912 CN200410016912 CN 200410016912 CN 200410016912 A CN200410016912 A CN 200410016912A CN 1667718 A CN1667718 A CN 1667718A
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- iron plate
- magnet
- collimation
- drive unit
- yoke
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Abstract
The invention relates to a collimation drive apparatus, a magnetic spring framework to improve the linear characteristics range and magneto elastic constant k for compensating sphere error of discs in a collimation drive apparatus. In said apparatus of this invention, the magnetic spring framework is provided with an iron plate for driving collimation lens, a drive coil, magnet and magnet yoke, by means of adjusting the number and width of the magnet, to adjust the linear characteristics range and magneto elastic constant k. The invention settles the iron plate inside the drive coil to enhance the linear characteristics range. It makes possible to take two iron plates, plate in the H form or quadrangle ring form. The magnetic spring prevents the iron plate splitting in the z axes direction to improve the structural properties via altering the structure of the iron plate. The collimation drive apparatus invented can be compensated sphere error of discs by the magnet spring making use of the adjusted magneto elastic constant k and linear characteristics range.
Description
(1) technical field
The invention relates to the collimation drive unit, refer in particular in the video disc recording player, utilize the collimation drive unit, dwindle between the spherical surface error compensating basin of CD or improve a kind of collimation drive unit of structure of the distortion magnet spring of driving force.
(2) background technology
Recently, along with the raising of the level of consumption, the user is more and more higher to the requirement of the moving image processing of high image quality.To should situation, optical disc data memory capacity also needs increase rapidly.
Usually, the optical disc data capacity mainly is by the optical maser wavelength of light picker in the video disc recording player with to aperture value (N.A) decision of thing lens.
For instance, use in the middle of DVD (the Digital video recording) system blue laser of 400nm and aperture value be 0.85 to the thing lens.Under the effect of this dvd system, on simple layer (Singlelayer) CD of CD size, can store the data of 22G byte.
Fig. 1 is the sketch map of existing HD level optical system (light picker).
As shown in Figure 1, this system comprises: laser diode 1 produces laser beam; Grating 3, the laser beam that above-mentioned laser diode 1 is produced is decomposed into three laser beams; Optical splitter 5 is along with the incident direction that above-mentioned grating 3 decomposes the three beams of laser light beam that obtains, conversion reflection direction; Collimation lens 7 will be converted to parallel beam by the laser beam of above-mentioned optical splitter 5; To thing lens 9, will reflect from the parallel laser light beam of above-mentioned collimation lens 7 incidents, form the hot spot that shines on the CD 10; Light-collecting lens 11 will carry out optically focused from above-mentioned CD 10 laser light reflected light beams; Imaging diode 13 detects digital signal the laser beam that the quilt that obtains from above-mentioned light-collecting lens 11 is assembled.
The optical instrument that uses in the middle of the above-mentioned light picker is to detect data by following mode.
At first, in above-mentioned CD 10 records/played data, by above-mentioned grating 3, be broken down into three laser beams from the laser beam (laser beam) of above-mentioned laser diode 1 irradiation.Decompose the laser beam that obtains from above-mentioned grating 3 and incide above-mentioned optical splitter 5, this optical splitter 5 has the characteristic that light is separated, and the light beam that incides a side direction is passed through, and the light beam that will incide the opposite side direction then carries out the refraction of vertical direction.
Then, the laser beam incident by above-mentioned optical splitter 5 is to above-mentioned to thing lens 9, thereby can form hot spot.Incide above-mentioned light beam to thing lens 9 this moment is the laser beam with radiation state, so for it being become the laser beam that straight parallel is advanced, need above-mentioned collimation lens 7 be set at front end.
By the laser beam of above-mentioned collimation lens 7, to having formed the hot spot of focus in the middle of the thing lens 9, shine then on the above-mentioned CD 10 with certain diameter from above-mentioned.Above-mentioned CD 10 laser light reflected bundles shine imaging diode 13 by the optical splitter 5 and the light-collecting lens 11 of above-mentioned beam splitting.Above-mentioned imaging diode 13 is analyzed the light quantity of the laser beam that is reflected, convert certain signal to after, be sent to Data Detection portion (not shown).
Above-mentioned HD level optical system can produce spherical surface error because of the deviation of CD overlayer (disc cover layer), thereby breaks away from the permissible value of optical parallax.
Especially, double-layer CD (dual layer disc) comprises that seeing through layer (transparent layer) and reflection horizon (reflective layer) constitutes, and is spaced apart tens of microns between two-layer.This interval may produce very big cover layer thickness deviation.So, will produce spherical surface error because of this cover layer thickness deviation.
Need utilize an axial brake device in order to compensate this spherical surface error, move collimation lens along optical axis direction.
Such as, use and utilize magnet spring to move the drive unit of collimation lens.As described in reference Fig. 2.
Fig. 2 is existing collimation lens drive unit figure.
With reference to Fig. 2, along optical axis direction collimation lens 21 is set, the sidepiece of above-mentioned collimation lens 21 is attached on the lens carrier 23.
Said lens support 23 inside are provided with iron plate (iron strip) 25, and the drive coil 27 that produces electromagnetic force according to the importing of electric current is set thereon.
In addition, said lens support 23 obtains the support with fixed part 35 joining leaf springs (leaf spring) 29.
In addition, be used for preventing electromagnetic force loss, keep the U font yoke 31 of bigger electromagnetic force to be arranged between said lens support 23 and the said fixing portion 35 simultaneously, and relative with above-mentioned drive coil 27.The magnet 33 that produces magnetic force is set in above-mentioned U font yoke 31 inside.
Usually, the borderline magnetic force maximum of magnet 33 and U font yoke 31.
Therefore, the iron plate 25 that is arranged on said lens support 23 inside is understood the border that attempt to be aligned to the strongest magnet of magnetic force 33 and U font yoke 31 under the effect of magnetic force.Two borders that magnetic force is big just become settling position (stable position) like this.
Therefore, when above-mentioned iron plate 25 is not introduced electric current in above-mentioned drive coil 27, can be arranged on of two settling positions.
When using double-layer CD, above-mentioned iron plate 25 can be arranged in one of two settling positions, thereby can compensate the spherical surface error that bilayer causes like this.
Fig. 3 is the graph of relation of displacement and driving force.
As shown in Figure 3, occur 3 zero cross points in the curve map, wherein two stable zero cross points have been put on circle (circle).
This stable zero crossing partly be with respect to 21 of two-layer collimation lenses should the optimum position, promptly above-mentioned settling position (stable position).
As shown in Figure 3, the displacement length between 2 stable zero cross points is between double-layer CD two-layer during space width, just above-mentioned collimation lens 21 is moved in two stable zero cross points, thereby can compensate the spherical surface error of CD.
As shown in Figure 3, behind the importing electric current, the position of collimation lens 21 just can change in above-mentioned drive coil 27.That is, during input (+) electric current, settling position moves right.Opposite, during input (-) electric current, settling position just is moved to the left.But, this move than two settling positions between displacement very little displacement just appears.
Like this, mobile collimation lens 21 is located in two settling positions, makes one deck of its corresponding double-layer CD.Then to drive coil 27 input currents, trickleer mobile collimation lens, thus can compensate the spherical surface error of CD to greatest extent.
But, different with the flux Density Distribution of U font yoke 31 in the existing collimation lens drive unit owing to magnet 33, and the driving force of iron plate 25 produces heterogeneity, so be difficult to improve between the linear characteristic of magnet spring (magnet spring that is made of described iron plate 25, drive coil 27, magnet 33 and the yoke 31 that is used to drive collimation lens 21).
In addition, after iron plate 25 is aligned to the border of magnet 33 and U font yoke 31, be positioned at above-mentioned U font yoke 31 relative positions on the magnetic force of drive coil will diminish, therefore just obtaining having obtained restriction on the high drive characteristic in terms of overall.
Therefore, in order to widen the interval that is used to compensate spherical surface error from now on, and the needs of corresponding high drive, need the new magnet spring structure of exploitation.
(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 a kind of collimation drive unit that can the variable adjustment collimation lens carries out the spherical surface error compensation of CD.
The object of the present invention is to provide a kind of structure that can change the magnet spring that is applied to collimation lens, widen the collimation drive unit in linear characteristic interval.
The object of the present invention is to provide a kind of structure that can change the magnet spring that is applied to collimation lens, improve the collimation drive unit of driving force characteristic.
The object of the present invention is to provide a kind of collimation drive unit of widening the linear characteristic interval or improving the driving force characteristic.
To achieve these goals, the invention provides a kind of collimation drive unit, comprise: iron plate is set in lens carrier inside, described iron plate is provided with the drive coil that produces electromagnetic force according to the importing of electric current, described lens carrier obtains the support with the joining leaf spring of described fixed part, in addition, be used for preventing the electromagnetic force loss, the yoke of the electromagnetic force that maintenance is bigger is arranged between described lens carrier and the fixed part simultaneously, and it is relative with described drive coil, the magnet that produces magnetic force is set on described yoke, the left side, front of described yoke, right position is provided with the magnet of identical polar, and the magnet that opposite polarity is set in central authorities is characterized in that:
Described iron plate can be arranged on the inside of above-mentioned drive coil.
In addition, described iron plate has two, and two iron plates can be arranged in parallel up and down.
Described iron plate can be the H font, also can be four square ring shapes.
A kind of collimation drive unit, in the middle of described collimation drive unit, the magnet spring structure that constitutes by the iron plate that is used for driving collimation lens, drive coil, magnet and yoke, it is characterized in that: the left and right position, front of described yoke is provided with the magnet of identical polar, is provided with the magnet of opposite polarity in central authorities.
A kind of collimation drive unit, in the middle of described collimation drive unit, magnet spring by the iron plate that is used for driving collimation lens, drive coil, magnet and yoke constitute is characterized in that: described magnet is a homopolar magnet, is arranged on the central authorities of described yoke.
A kind of magnet spring that collimates drive unit, in the middle of the collimation drive unit, the magnet spring that constitutes by the iron plate that is used for driving collimation lens, drive coil, magnet and yoke, it is characterized in that: the left and right magnet that is provided with identical polar in the front of described yoke, the teat of described yoke is arranged on central authorities.
Effect of the present invention:
In the middle of the magnet spring structure of the present invention that has above-mentioned formation and operate as mentioned above, the number of regulating magnet or directly iron plate is set to drive coil can be regulated magnet spring constant k and linear characteristic interval.
In addition, magnet spring of the present invention can prevent iron plate in the axial inclination of z by change iron plate structure, improves architectural characteristic.
In addition, the magnet spring constant k that collimation drive unit of the present invention utilization regulates and the magnet spring in linear characteristic interval can compensate the spherical surface error of CD.
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 sketch map of existing HD level optical system;
Fig. 2 is existing collimation lens drive unit figure;
Fig. 3 is the graph of relation of displacement and driving force;
Fig. 4 is the example structure figure of the magnet spring of collimation drive unit of the present invention;
Fig. 5 is the structural drawing of another embodiment of the magnet spring of collimation drive unit of the present invention;
Fig. 6 is the another example structure figure of the magnet spring of collimation drive unit of the present invention;
Fig. 7 is the another example structure figure of the magnet spring of collimation drive unit of the present invention:
Fig. 7 a is an outboard profile,
The sectional view of Fig. 7 b for seeing from " A " face,
The sectional view of Fig. 7 c for seeing from " B " face;
Fig. 8 is the structural drawing of the magnet spring that is used to compensate Z axle deviation in the middle of the another embodiment of collimation drive unit of the present invention:
Fig. 8 a is the magnet spring structure figure of two iron plates of use,
Fig. 8 b is the magnet spring structure figure of use H font iron plate,
Fig. 8 c is for using the magnet spring structure figure of four square ring shape iron plates.
(5) embodiment
Below with reference to accompanying drawings embodiments of the invention are elaborated.
The invention provides a kind of collimation drive unit, same as the prior art comprises: in lens carrier inside iron plate is set, described iron plate is provided with the drive coil that produces electromagnetic force according to the importing of electric current, described lens carrier obtains the support with the joining leaf spring of described fixed part, in addition, be used for preventing the electromagnetic force loss, the yoke of the electromagnetic force that maintenance is bigger is arranged between described lens carrier and the fixed part simultaneously, and relative with described drive coil, the magnet that produces magnetic force is set on described yoke.
The structure of the magnet spring that the iron plate among the present invention, drive coil, yoke, magnet are formed utilizes following several embodiment to be elaborated.
[embodiment 1]
Fig. 4 is the example structure figure of the magnet spring of collimation drive unit of the present invention.
As shown in Figure 4, its structure is provided with three magnet for the yoke 51 on plane.Left and right position, front is provided with the magnet 54,56 of identical polar, and the magnet 55 of opposite polarity is set in central authorities.
Left and right magnet 54,56 is identical polar in three magnet, and central magnet 55 is another polarity.In the middle of Fig. 4, central magnet 55 is the N utmost point, and left and right magnet 54,56 is S utmost point magnet.Like this, iron plate 53 will be arranged on the border of central magnet 55 and left and right magnet 54,56.The magnet spring constant K of magnet spring structure as shown in Figure 4 is significantly improved, so driving force has also just increased thereupon.
Magnet spring possesses said structure Hou, replace U font yoke of the prior art with left and right magnet 54,56, therefore can solve problem owing to the different very difficult raising linear characteristic intervals that cause of flux distribution of magnet and yoke, and the drive coil relative with yoke be subjected to yoke influence, thus the problem that its electromagnetic force descends and causes whole driving force to descend.
That is, left and right magnet 54,56 when improving linear characteristic, can improve the electromagnetic force of the drive coil relative with left and right magnet with the flux homogenization that distributes among the present invention, thereby can wholely improve driving force.
If only consider the simple property problem of manufacturing price or structure merely, the structure of magnet spring shown in Figure 5 is more suitable.
[embodiment 2]
Fig. 5 is the structural drawing of another embodiment of the magnet spring of collimation drive unit of the present invention.
As shown in Figure 5, its structure is for being provided with one pole speech iron (the N utmost point) 57 on the medium position of the yoke 51 on plane.Like this, iron plate 53 will be arranged in the two ends of magnet 57.But than the structure of it magnet spring shown in Figure 4, driving force has on the whole reduced comparatively speaking.
The structure of magnet spring shown in Figure 5 be suitable for being applied to require cheap, simple in structure, and the situation of less magnet spring constant K.
[embodiment 3]
Fig. 6 is the another example structure figure of the magnet spring of collimation drive unit of the present invention.
As shown in Figure 6, its structure comprises T font yoke 61 and two homopolar magnets 58,59.That is left and right two homopolar magnets 58,59 that are provided with in the front of the teat 60 on the T font yoke 61.Here two homopolar magnets 58,59 preferably have the identical polar form S utmost point.
Have in the magnet spring of said structure, two homopolar magnets 58,59 can induce the teat 60 of above-mentioned T font yoke 61 to possess phase diamagnetism (the N utmost point).Like this, the teat 60 of above-mentioned T font yoke 61 also can play the effect of a magnet.
Like this, iron plate 53 just can be arranged on the border between above-mentioned teat 60 and two homopolar magnets 58,59.
According to the structure of as shown in Figure 6 magnet spring, can guarantee big linear characteristic interval.
Like this, as mentioned above,, can obtain between different mutually magnet spring constant K and linear zone (seeing Table 1) by embodiment 1,2,3 described multiple magnet springs.
[table 1]
| Embodiment | Magnet spring constant { N/m} | { mm} between linear zone |
| Embodiment 1 | ????920 | ????0.9 |
| | ????320 | ????1.1 |
| Embodiment 3 | ????590 | ????1.2 |
Table 1 is magnet spring constant and the linear interval value that the Structure Calculation according to the magnet spring of each embodiment obtains.
As shown in table 1, the magnet spring constant is maximum in the middle of embodiment 1, and is minimum among the embodiment 2.In addition, minimum in the middle of embodiment 1 between linear zone, maximum among the embodiment 3.
Like this, just can calculate, can obtain between different mutually magnet spring constant K and linear zone according to multiple magnet spring.Therefore, the standard value drive unit that is used to compensate spherical surface error just can use different magnet spring structures, thereby can compensate the spherical surface error of required compensation.
In addition, in the middle of the various embodiments described above,, also be variable between linear zone along with the width difference of magnet or T font yoke (teat of saying so exactly).That is, the width of magnet or T font yoke is big, and linear characteristic is interval just big; Opposite, if the width of magnet or T font yoke is little, the linear characteristic interval is just little.
Therefore, be different with the width adjusting of magnet and T font yoke, the linear characteristic interval that can satisfy the demand fully.
[embodiment 4]
Fig. 7 is the another example structure figure of the magnet spring of collimation drive unit of the present invention.Fig. 7 a is an outboard profile.The sectional view of Fig. 7 b for seeing from " A " face.The sectional view of Fig. 7 c for seeing from " B " face.
In the middle of the prior art, shown in the illustration 2, iron plate 25 is inserted into lens carrier 23 inside, is provided with drive coil 27, at this moment, can separate certain distance (i.e. gas lid AIRCAP) between magnet 33 and the iron plate 25 at its front end.
In addition, iron plate 25 is inserted into being not easy that the engineering of said lens support 23 can become.
Use magnet spring structure as shown in Figure 7, engineering can become simply, and the distance between iron plate 25 and the magnet 33 also can dwindle relatively, so also can increase the magnet spring constant k.
That is, as shown in Figure 7, yoke 51 is provided with three magnet 54,55,56.Iron plate 65 is not inserted into lens carrier in the present embodiment, and is arranged on the inside of dimetric drive coil 63.
Like this, the gas lid between central magnet 55 and the iron plate 65 will dwindle relatively, and the constant k of magnet spring will increase like this.
In addition, as long as it is just passable that iron plate 65 simply is set to the inside of dimetric drive coil 63,, engineering is easy to so also becoming.
So far, just the situation that a straight tetragonal iron plate 65 only is set is illustrated.
As mentioned above, just with an iron plate, accurate value lens are when optical axis direction moves, and iron plate 65 can produce along Z-direction (with reference to Fig. 7 b) meeting generation inclination composition, and iron plate can produce with respect to having a down dip on the optical axis direction.
To please refer to embodiment 5 described if want to address the above problem.
[embodiment 5]
Fig. 8 is the structural drawing of the magnet spring that is used to compensate Z axle deviation in the middle of the another embodiment of collimation drive unit of the present invention.Wherein: Fig. 8 a is for using the magnet spring structure figure of two iron plates; Fig. 8 b is for using the magnet spring structure figure of H font iron plate; Fig. 8 c is for using the magnet spring structure figure of four square ring shape iron plates.
Shown in Fig. 8 a, need to use 2 iron plates in the magnet spring structure.That is, the structure of magnet spring is for being set in parallel in two long straight tetragonal iron plates 71,73 upper-lower position of central magnet.
In addition, shown in Fig. 8 b, need to use H font iron plate 75 in the middle of the magnet spring structure.That is, the structure of magnet spring is for to be arranged on central magnet with a H font iron plate 75.
In addition, shown in Fig. 8 c, need to use four square ring shape iron plates 77 in the middle of the magnet spring structure.That is, the structure of magnet spring is for to be arranged on central magnet with one four square ring shape iron plate 77.
Above-mentioned iron plate is applied in the middle of the above-mentioned magnetic spring structure, will eliminates the inclination composition, prevent that iron plate from tilting.
Certainly, in the middle of the above-mentioned magnet spring structure,, but directly be set to drive coil inside, also can increase the magnet spring constant k if iron plate is not inserted into lens carrier.
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 (24)
1, a kind of collimation drive unit, comprise: iron plate is set in lens carrier inside, described iron plate is provided with the drive coil that produces electromagnetic force according to the importing of electric current, described lens carrier obtains the support of the leaf spring that is connected with described fixed part, in addition, be used for preventing the electromagnetic force loss, the yoke of the electromagnetic force that maintenance is bigger is arranged between described lens carrier and the fixed part simultaneously, and it is relative with described drive coil, the magnet that produces magnetic force is set on described yoke, it is characterized in that:
The left and right position, front of described yoke is provided with the magnet of identical polar, and the magnet of opposite polarity is set in central authorities.
2 collimation drive units as claimed in claim 1 is characterized in that:
Described iron plate is arranged on the inside of described drive coil.
3, collimation drive unit as claimed in claim 1 is characterized in that:
Described iron plate has two, two upper and lower be arrangeding in parallel of iron plate.
4, collimation drive unit as claimed in claim 1 is characterized in that:
Described iron plate is the H font.
5, collimation drive unit as claimed in claim 1 is characterized in that:
Described iron plate is four square ring shapes.
6, collimation drive unit as claimed in claim 1 is characterized in that:
A homopolar magnet is installed by the central authorities of described yoke.
7, collimation drive unit as claimed in claim 1 is characterized in that:
Two magnet of described identical polar are arranged on the front and arranged on left and right sides of described yoke, and the teat of described yoke is arranged on central authorities.
8, collimation drive unit as claimed in claim 1 is characterized in that:
Described yoke forms " T " font.
9, a kind of collimation drive unit, in the middle of described collimation drive unit, the magnet spring structure by the iron plate that is used for driving collimation lens, drive coil, magnet and yoke constitute is characterized in that:
The left and right position, front of described yoke is provided with the magnet of identical polar, is provided with the magnet of opposite polarity in central authorities.
10, collimation drive unit as claimed in claim 9 is characterized in that:
Described iron plate is arranged on the inside of described drive coil.
11, collimation drive unit as claimed in claim 9 is characterized in that:
Described iron plate has two, two upper and lower be arrangeding in parallel of iron plate.
12, collimation drive unit as claimed in claim 9 is characterized in that:
Described iron plate is the H font.
13, collimation drive unit as claimed in claim 9 is characterized in that:
Described iron plate is four square ring shapes.
14, a kind of collimation drive unit, in the middle of described collimation drive unit, the magnet spring by the iron plate that is used for driving collimation lens, drive coil, magnet and yoke constitute is characterized in that:
Described magnet is a homopolar magnet, is arranged on the central authorities of described yoke.
15, collimation drive unit as claimed in claim 14 is characterized in that:
Described iron plate is arranged on the inside of described drive coil.
16, collimation drive unit as claimed in claim 14 is characterized in that:
Described iron plate has two, two upper and lower be arrangeding in parallel of iron plate.
17, collimation drive unit as claimed in claim 14 is characterized in that:
Described iron plate is the H font.
18, collimation drive unit as claimed in claim 14 is characterized in that:
Described iron plate is four square ring shapes.
19, a kind of magnet spring that collimates drive unit, in the middle of the collimation drive unit, the magnet spring by the iron plate that is used for driving collimation lens, drive coil, magnet and yoke constitute is characterized in that:
The left and right magnet that is provided with identical polar in the front of described yoke, the teat of described yoke is arranged on central authorities.
20, collimation drive unit as claimed in claim 19 is characterized in that:
Described yoke is the T font.
21, collimation drive unit as claimed in claim 19 is characterized in that:
Described iron plate is arranged on the inside of described drive coil.
22, collimation drive unit as claimed in claim 19 is characterized in that:
Iron plate has two, described two upper and lower be arrangeding in parallel of iron plate.
23, collimation drive unit as claimed in claim 19 is characterized in that:
Described iron plate is the H font.
24, collimation drive unit as claimed in claim 19 is characterized in that:
Described iron plate is four square ring shapes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410016912 CN1667718A (en) | 2004-03-12 | 2004-03-12 | Alignment driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410016912 CN1667718A (en) | 2004-03-12 | 2004-03-12 | Alignment driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1667718A true CN1667718A (en) | 2005-09-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410016912 Pending CN1667718A (en) | 2004-03-12 | 2004-03-12 | Alignment driving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1667718A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013578B (en) * | 2006-01-31 | 2010-12-29 | 株式会社日立媒介电子 | Optical pickup |
-
2004
- 2004-03-12 CN CN 200410016912 patent/CN1667718A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013578B (en) * | 2006-01-31 | 2010-12-29 | 株式会社日立媒介电子 | Optical pickup |
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