CN101140768A - Optical pick-up device executor - Google Patents
Optical pick-up device executor Download PDFInfo
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- CN101140768A CN101140768A CNA2006100308380A CN200610030838A CN101140768A CN 101140768 A CN101140768 A CN 101140768A CN A2006100308380 A CNA2006100308380 A CN A2006100308380A CN 200610030838 A CN200610030838 A CN 200610030838A CN 101140768 A CN101140768 A CN 101140768A
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Abstract
The invention relates to an actuator for optical interrogation device, which comprises a mobile objective support frame used for fixing the objective, and a tracking coil convolved in trapezoid at the center position on both sides of the objective support frame, a focusing coil convolved in inverted trapezoid on the left and right of both sides of the said objective support frame, a polar multipole magnet matched with the upward and downward directions of the said focusing coil. The invention improves the sensitivity of the focus point and guarantees its linear feature.
Description
Technical field
The present invention relates to a kind of optical pick-up actuator (optical pick-up actuator), refer more particularly to and to make the object lens bracing frame be set to down trapezoidal a kind of optical pick-up actuator along the coil shape of focus direction running.Simultaneously, also relate to and around focusing coil, tilt coil to be pushed down the trapezoidal a kind of optical pick-up actuator that superposes and be provided with, simultaneously, also relate to and focusing coil and tilt coil can be pushed down the trapezoidal a kind of optical pick-up actuator that is arranged on front/rear position.
Background technology
In general, the effect of optical pick-up actuator is exactly that the inscape (bobbin, lens holder) that comprises object lens is moved, and (for example: remain on certain position CD) relatively makes object lens and optical recording media.In addition, the another one effect of optical pick-up actuator is exactly the magnetic track of tracking illumination recording medium, and information is stored or canned data is read out.
Fig. 1 is the structural representation of the optical pick-up actuator of prior art; Fig. 2 is the inclination instance graph of magnetic circuit medium dip coil shown in Figure 1.
With reference to Fig. 1 as can be seen, optical pick-up actuator is made of following components: with object lens 201 centre-locks and the object lens bracing frame 202 that makes it to turn round, be the magnetic circuit that makes the object lens bracing frame can turn round and be connected with the side.Above-mentioned magnetic circuit is made of following components: follows the tracks of and focusing coil 205,206, and tilt coil 217, yoke plate 203 and multipole magnet (204:204a, 204b, 204c, 204d).
As depicted in figs. 1 and 2, a left side, object lens bracing frame 202 both sides/right position is provided with focusing coil 205 in order to carry out focusing function, and (204a, 204c) (204b, vertical critical surface 204d) is corresponding with magnet polarity respectively for its polarity.The center of object lens bracing frame 202 both sides is provided with tracking coil 206 in order to carry out following function, and (204a, horizontal critical surface 204b) is corresponding with magnet polarity respectively for its polarity.In addition,, around object lens bracing frame 202, be wound with tilt coil 217, it with/(204a, polarity critical surface 204b) is corresponding for right side magnet.
Fig. 3 is the center of gravity and the center of the tracking synoptic diagram of the optical pick-up actuator of prior art.
In addition, as shown in Figures 2 and 3, magnet 2 04 comprises magnet 204a, the 204c of " " font, and they are provided with symmetrically.On a left side/the bottom righthand side position is provided with opposite polarity magnet 204b, the 204d of polarity and " " font magnet.As an example of this magnet 204, it both can be made of the magnet with multi-polar magnetic, also can be made of 4 magnet with one pole magnetic.
This magnet 204 have with the corresponding mutually different polarity 204a in center, the 204c of the tracking coil 206 of along continuous straight runs rotation and with the vertically corresponding mutually different polarity 204a in center, the 204b of the focusing coil 105 of rotation, they are corresponding with tilt coil 217 magnet polarity 204a, 204b.Above-mentioned tilt coil 217 can be used as the radiation tilt coil and uses.
In addition, along the left side of object lens bracing frame 202, the right side is fixed on the inboard of " U " font yoke plate 203 that is made of the ferromagnetism material to multipole magnet 204 respectively, and yoke plate 203 constitutes an integral body by coupling arrangement and optical pickup base (not indicating on the figure).
In addition, as shown in Figure 1, on the object lens bracing frame 202, the center of lower side combines with fixed part, one end and each fixed part of 2 suspension coils 207 that are parallel to each other fix, and the other end of above-mentioned suspension coil 207 fixes with mainboard by the framework 209 that is positioned at object lens bracing frame 202 1 sides.The effect of this suspension coil 207 is supported above-mentioned object lens bracing frame 202 exactly, serves as the junction line of supplying electric current simultaneously.
Here, can damping and be provided with damper (indicating on the figure) in order to make rubber-like hang coil 207 in the inboard of framework 209, the other end of above-mentioned suspension coil 207 is fixed on the mainboard by soldering.
The ruuning situation of above-mentioned actuator as shown in Figure 3, be fixed on a left side, the both sides/right part position of object lens bracing frame 101 focusing coil 205 along with the direction winding of 206 one-tenths orthogonals of tracking coil.Electric current is arranged through out-of-date on above-mentioned focusing coil 205, magnetic flux just produces along the vertical direction.In this case, just produce with the magnetic flux of focusing coil 205 corresponding multipole magnets 203 in the vertical direction of the effect lower edge of electromagnetic field and focusing coil 205.At this moment, object lens bracing frame 202 just moves along focus direction (vertical on/down), thereby the focus servosystem of correcting action is brought into operation.
The tracking coil 206 that is fixed on two centers of object lens bracing frame 202 twines along suitable direction, and through out-of-date, magnetic flux just produces along the direction of regulation as electric current.Like this, under the effect of fixing multipole magnet 204 and electromagnetic force, will produce reacting force and repulsive force.Under the effect of above-mentioned reacting force and repulsive force, object lens bracing frame 202 will move along tracking direction (left side, right).Thereby the tracking servo of revising tracking error is brought into operation.
In addition, as shown in Figure 2, electric current is arranged through out-of-date when being wrapped on object lens bracing frame 202 tilt coil 217 on every side, with above-mentioned tilt coil 217 corresponding multipole magnet (204a, under the effect of another polarity 204b), a left side/right side that just can make object lens bracing frame 202 is along opposite direction rotation.
Above-mentioned object lens bracing frame 202 moves along tracking and focus direction with the coil 205,206 that is fixed on both sides, and this is known as mobile (moving) coil mode.In contrast, multipole magnet is fixed on the periphery of object lens bracing frame, and above-mentioned multipole magnet moves with the object lens bracing frame, and this is known as the moving magnet mode.In this case, the move mode of magnet and coil just utilizes the Lorentz force of Fu Laiming lefft-hand rule.
With the gestalt movement of moving coil, it can move to object lens on the assigned position of optical recording media above-mentioned optical pick-up actuator under the effect of the magnetic of permanent magnet.In this case, the moving part of above-mentioned optical pick-up actuator (moving part), promptly object lens bracing frame (lens holder) is fixed by the suspension coil with elasticity and shock absorbing characteristics, just makes it have desirable frequency characteristic when design.In addition, above-mentioned object lens bracing frame can promptly focus on the motion of (focusing) direction and tracking (tracking) direction simultaneously along orthogonal both direction.In order to reduce the error of optical signalling, under the state that does not have vibrations, move with regard to guaranteeing it.
But as shown in Figure 3, when the tracking direction along the object lens bracing frame drove, center of gravity (WC) will be inconsistent with the center (TC) of tracking coil 206, will cause like this moving with roll mode (rolling mode) under the high frequency state.Operation will cause the phase place disorder under this rolling frequency state.Generally, the rolling frequency is between 100-120Hz, and it can be consistent with the gyro frequency of CD.In this case, situation such as run-off the straight will cause harmful effect to control system.
Fig. 4 is the instance graph of the tracking coil rolling mode of prior art.
The reason that produces this rolling phenomenon as shown in Figure 4, it be by along the center of gravity (wcl) of short transverse with cause along the center of tracking direction power is inconsistent.That is to say, be exactly the center of object lens bracing frame along the center of gravity of short transverse.On the contrary, the center of tracking direction power (F) is consistent with the center of tracking coil 206.Like this, will produce apart from the difference on (d).When this object lens bracing frame when tracking direction drives, the magnetic force that produces between magnet and tracking coil is just inhomogeneous, thereby will cause changing along the center of tracking direction power (Fd).
Fig. 5 is the trapezoidal tracking coil structural representation of the tracking coil rolling mode of prior art.
In order to address the above problem, as shown in Figure 5, offset inconsistent and moment of torsion (torqe) that produce just needs to adopt trapezoidal tracking coil 306 by driving center and mass centre.That is to say, the active coil of tracking coil 306 is partly tilted, it is produced outside certain power (Fd) along main direction, also produce certain power (F) along last/following direction.Just the moment of torsion that produces roll mode can be offset by the reactive torque (Fd ') that utilizes this method to produce.
That is to say, owing to the driving center has identical value with inconsistent moment of torsion that produces of mass centre (d * F * cos θ) and the reactive torque (W/2 * F * sin θ=d * Fcos θ) that adopts trapezoidal coil to produce.Therefore, just need make the certain angle (θ) of tracking coil 306 inclinations, thereby form trapezoidal.
The optical pick-up actuator structure that adopts this trapezoidal tracking coil 306 is as shown in Figure 6. and Fig. 6 is the structural representation of optical pick-up actuator that adopts the trapezoidal tracking coil of prior art, it is not elaborated at this.
As shown in Figure 6, be wound with trapezoidal tracking coil 306 respectively in the center, both sides of object lens bracing frame 301, on a left side/the right part position is wound with focusing coil 305 respectively, is wound with tilt coil 317 in the outside respectively.Here, tilt coil 317 can be used as the use of radiation tilt coil.In addition, also be provided with the mutually different magnet 304 of polarity of polarity and above-mentioned each coil 305,306,317.
In order to make the certain angle of above-mentioned tracking coil 306 inclinations, can tilt along the direction that the upside amplitude that makes tracking coil 306 reduces, also can tilt along the direction of the downside amplitude broadening that makes tracking coil 306.But, when tilting, just need to consider movable range along the direction that its upside amplitude is reduced.In this case, just be difficult to guarantee the size of tracking coil 306 internal diameters.As (a) among Fig. 7 with (b), just have only consideration when making 4 utmost point magnet 304, to increase its neutral region (neutral-zone).But from linear aspect, this also can bring suitable ill effect.
Fig. 7 is the structural representation of magnet shown in Figure 6, and here, shown in (a) among Fig. 7 is a kind of desirable magnet pattern, (b) among Fig. 7 expression be the pattern of the actual magnet that adopts of Fig. 6, what show among the figure is its natural region.
In order to address the above problem, just must guarantee to make the lateral direction of the downside amplitude broadening of trapezoidal tracking coil 306 to have enough spaces.But, in order to ensure above-mentioned space, just need in existing space, reduce the size of focusing coil, coil is moved laterally from its current location again.Like this, the structure of object lens bracing frame will be restricted, thereby causes focus sensitivity to reduce and linear characteristic decline.
Summary of the invention
The present invention proposes for addressing the above problem just, first purpose of the present invention is: a kind of optical pick-up actuator is provided, corresponding with tracking coil shape and oblique structure, the upside amplitude that makes the coil adjacent with above-mentioned tracking coil is than downside amplitude broad, thereby just can prevent effectively that the sensitivity decline of adjacent windings and the phenomenon that linear feature reduces from taking place.
Second purpose of the present invention is: provide a kind of upside amplitude for a left side/right side coil of making tracking coil to adopt the optical pick-up actuator of inverted trapezoidal structure than downside amplitude broad.
The 3rd purpose of the present invention is: a kind of laterally inclined with the adjacent phase coil of tracking coil of making is provided, and make tracking coil on/the mutually different optical pick-up actuator of bottom amplitude.
The 4th purpose of the present invention is: provide a kind of tracking coil and focusing coil stack are twined, and make above-mentioned tracking coil become the optical pick-up actuator of inverted trapezoidal structure with focusing coil.
The 5th purpose of the present invention is: provide a kind of the tracking coil of stack winding and the inside coiling of focusing coil are all tilted or crooked optical pick-up actuator.
The 6th purpose of the present invention is: provide a kind of tracking coil and focusing coil of making to repeat to twine along front/rear direction, and make the narrow optical pick-up actuator of its amplitude broad bottom, top amplitude.
To achieve these goals, optical pick-up actuator of the present invention is characterized in that, comprises following several sections:
Object lens are fixed the object lens bracing frame that also can move;
Be arranged on the trapezoidal tracking coil of the center, both sides of above-mentioned object lens bracing frame;
Be arranged on above-mentioned object lens bracing frame a left side, both sides/right position fall trapezoidal focusing coil;
Polarity is corresponding with a left side/right of above-mentioned tracking coil, with on the above-mentioned focusing coil/the corresponding multipole magnet of following direction.
Specifically, it is characterized in that narrow top, above-mentioned focusing coil bottom is wide.
Specifically, it is characterized in that above-mentioned focusing coil is to the coil lateral vertical side coiling face tilt adjacent with above-mentioned tracking coil.
Specifically, it is characterized in that the angle of inclination of the side of two coils adjacent with tracking coil with above-mentioned focusing coil is identical.
The optical pick-up actuator of another embodiment of the present invention is characterized in that, comprises following several sections:
Object lens are fixed on the object lens bracing frame that the centre also can be moved; Press the tracking coil of trapezoidal winding in the centre, both sides of above-mentioned object lens bracing frame; The focusing coil of trapezoidal winding is pushed down in a left side, both sides/right position at above-mentioned object lens bracing frame; The tilt coil that superposes and twine at above-mentioned focusing coil respectively; Polarity is corresponding with a left side/right of above-mentioned tracking coil, and with above-mentioned focus point/tilt coil on/the corresponding multipole magnet of following direction.
Specifically, it is characterized in that above-mentioned tilt coil is pushed down trapezoidal shape stack and is wrapped on the above-mentioned focusing coil.
Specifically, it is characterized in that above-mentioned tilt coil is pushed down trapezoidal shape and twined along the inboard of above-mentioned focusing coil.
Specifically, it is characterized in that, above-mentioned tilt coil push down trapezoidal shape along the outer felt of above-mentioned focusing coil around.
Specifically, it is characterized in that above-mentioned tilt coil is pushed down the rear side that trapezoidal shape is wrapped in above-mentioned focusing coil.
Specifically, it is characterized in that above-mentioned tilt coil is pushed down the front side that trapezoidal shape is wrapped in above-mentioned focusing coil.
Specifically, it is characterized in that, make the laterally inclined of the coil adjacent for narrow top, the bottom that makes focusing/tilt coil is wide with above-mentioned tracking coil.
Specifically, it is characterized in that, above-mentioned focusing/tilt coil to the assigned position bending of above-mentioned tracking coil adjacent windings side.
In addition, to achieve these goals, a kind of optical pick-up actuator of the present invention, be for the object lens bracing frame that makes fixing object lens by the optical pick-up actuator that the multiaxis mode turns round, it is characterized in that:
The magnetic circuit of optical pick-up actuator comprises following several sections: the trapezoidal tracking coil that is wrapped in centre, above-mentioned object lens bracing frame both sides, be wrapped in above-mentioned tracking coil a left side/right part position fall trapezoidal focusing coil, the corresponding multipole magnet of polarity of its 2 polarity and above-mentioned focusing coil and tracking coil, and the yoke plate of fixed magnet.
Be wound with focusing coil and tilt coil in the stack of the side of above-mentioned focusing coil.
Effect of the present invention:
As mentioned above, optical pick-up actuator of the present invention has following effect: for the reading of high density compact disc, storing driver system, the phase place disorder that causes for the rolling mode of eliminating by actuator, when changing the shape of tracking coil, just corresponding with the shape of above-mentioned tracking coil, can prevent that focus sensitivity and linear feature from descending.Simultaneously, even under the situation about being restricted in the space, also desirable focusing coil and tilt coil can be set.
In addition, for adopting 2 or 3 shaft-driven actuators, can guarantee the focusing coil effective length to greatest extent.Like this, just not only can improve the sensitivity of focusing, but also can strengthen linear feature.
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.
Description of drawings
Fig. 1 is the structural representation of optical pick-up actuator of an embodiment of prior art;
Fig. 2 is the inclination instance graph of magnetic circuit medium dip coil shown in Figure 1;
Fig. 3 is the center of gravity and the center of the tracking synoptic diagram of the optical pick-up actuator of prior art;
Fig. 4 is the instance graph of the tracking coil rolling mode of prior art;
Fig. 5 is the trapezoidal tracking coil structural representation of the tracking coil rolling mode of prior art;
Fig. 6 is the structural representation of optical pick-up actuator that adopts the trapezoidal tracking coil of prior art;
Fig. 7 is the structural representation of magnet shown in Figure 6;
Fig. 8 is the structural representation of the optical pick-up actuator of first embodiment of the invention;
Fig. 9 is the present invention's magnetic structure synoptic diagram shown in Figure 8;
Figure 10 is magnet and a loop construction synoptic diagram shown in Figure 9;
(a) among Figure 11 and (b) represent focusing coil structural representation of the present invention respectively;
Figure 12 is the structural representation of the optical pick-up actuator of second embodiment of the invention;
(a) among Figure 13 is the magnetic structure synoptic diagram of 3 actuators of expression prior art; (b) be the magnetic structure synoptic diagram of expression second embodiment of the invention;
Figure 14 is the coil and the magnet arrangement synoptic diagram of expression second embodiment of the invention;
Figure 15 is the focusing coil of expression second embodiment of the invention and the structural representation of tilt coil;
Figure 16 is the focusing coil of expression second embodiment employing and another form synoptic diagram of tilt coil;
Figure 17 is the structural representation of the optical pick-up actuator of expression third embodiment of the invention;
Figure 18 is the magnetic structure synoptic diagram of expression third embodiment of the invention.
The symbol description of major part in the accompanying drawing:
101, object lens 102, object lens bracing frame
103, yoke plate 104,134, and 144, magnet
105,135,145, focusing coil 106,136,146, tracking coil
107,137,147, tilt coil 109, suspension coil
Embodiment
Below, the embodiment to optical pick-up actuator of the present invention is described in detail with reference to the accompanying drawings.
[the 1st embodiment]
Fig. 8 is the optical pick-up actuator structural representation of the present invention the 1st embodiment.
Ginseng Fig. 8 as can be seen, it comprises following several sections: the fixing object lens bracing frame 102 of object lens 101, push down trapezoidal shape and be wrapped in focusing coil 105 on a left side, above-mentioned object lens bracing frame both sides/right part position, be fixed on the trapezoidal tracking coil 106 on the center, above-mentioned object lens bracing frame both sides.Each coil 105,106 is all corresponding with multipole magnet.
Here, above-mentioned focusing coil 105 is wrapped on the coil support portion 108 with asymmetrical trapezoidal shape, and tracking coil 106 twines with the trapezoidal shape of symmetry.
Below, the optical pick-up actuator to the present invention the 1st embodiment is described in detail with reference to the accompanying drawings.
With reference to Fig. 8 as can be seen, two centers of object lens bracing frame 101 are provided with the tracking coil 106 that twines by trapezoidal shape, are wound with down trapezoidal focusing coil 105 in a left side, the both sides/right part position of the object lens bracing frame adjacent with above-mentioned tracking coil 106.
Above-mentioned focusing coil 105 is pushed down trapezoidal shape and is twined, and as shown in figure 10, the bottom amplitude (W1) of focusing coil 105 is narrow and top amplitude (W2) is wide, and it twines by asymmetrical form.
In addition, the side of the Inside coil of above-mentioned focusing coil 105 has the angle of inclination similar to the side of above-mentioned tracking coil 106.The coiling face of two like this, adjacent coils just is skewed.
Fig. 9 is the present invention's magnetic structure synoptic diagram shown in Figure 8, and Figure 10 is magnet and a loop construction synoptic diagram shown in Figure 9.
As Fig. 9 and shown in Figure 10, the horizontal polarization of tracking coil 106 and magnet 104 (104a, critical surface 104c) is corresponding, the vertical polarization of focusing coil 105 and magnet 104 (104a, and 104c) (104b, 104d) corresponding.Here, magnet 104 can be made of 4 magnet with one pole magnetic, also can be by 2 magnet with 2 utmost point magnetic, or the magnet with 4 utmost point magnetic constitutes.
In addition, focusing coil 105 is along the edge of the top amplitude (W2) of trapezoidal tracking coil 106, and (104a, amplitude 104c) is carried out the amplitude expansion in proportion to have the trapezoidal polarity of falling of symmetrical polarity according to the central part that is positioned at above-mentioned magnet 104.
In addition, the inboard coiling face of above-mentioned focusing coil 105, promptly with the certain angle of coiling face tilt of tracking coil 106 adjacent windings, it can begin once to bend the trapezoidal of distortion or merely according to falling the winding of tilting of trapezoidal shape according to the upper portion of coil-winding face internally.That is to say, shown in (a) among Figure 11, the certain angle (θ 1) of coiling face tilt of a lateral coil of focusing coil 105.Perhaps shown in (b) among Figure 11, vertical for the top (d1) of the lateral coil coiling face that can make tracking coil 105, make its underpart (d2) tilt also it once to be bent.(a) among Figure 11 and (b) represent focusing coil structural representation of the present invention respectively, here, the inverted trapezoidal structure shown in (a) among Figure 11 is favourable from the aspect that reduces resistance.Trapezium structure shown in (b) among Figure 11 is favourable from the aspect of handled easily.Therefore, can select as required in actual applications.
Adopt the above-mentioned trapezoidal focusing coil 105 and the trapezoidal tracking coil 106 that falls, the position of focusing coil 105 is not outwards moved, make the length sum (w1+w2) of active coil of focusing coil 105 constant simultaneously.That is to say, can increase the space of upper portion (w2) relatively, thereby its length is increased by adopting trapezoidal tracking coil 106.On the contrary, adopt trapezoidal loop construction, will increase the angle of inclination of tracking coil 106.Like this, will dwindle the space, thereby the length of lower portion (w1) is reduced.In this case, focusing coil 105 just can not cause the reduction of focus sensitivity.
In addition, can also improve auxiliary polarity (104c, 104d) linear feature of the lower portion on (w1) that is arranged on magnet 104 with 4 utmost point magnetic.
In above-mentioned the 1st embodiment, on 101 two centres of object lens bracing frame, be wound with trapezoidal focusing coil 105, on 101 two left sides of object lens bracing frame/right part position, be wound with down trapezoidal tracking coil 106.Object lens bracing frame 101 is moved along 2 direction of principal axis.Here, focusing coil 105 also can not adopt trapezium structure.In addition, identical with the situation of prior art, when the outer felt at object lens bracing frame 101 was wound with tilt coil 107, it just can move along 3 direction of principal axis.
In addition, be provided with 2 pairs or 3 pairs at least and hang coil 109 on object lens bracing frame 101, they can support object lens bracing frame 101.According to the situation of design, can be with it as transmission line to each coil supply power.
[the 2nd embodiment]
Figure 12 to Figure 16 is the situation synoptic diagram of the present invention the 2nd embodiment.Below, will be described in detail the 2nd embodiment.
Figure 12 is the structural representation to 3 optical pick-up actuators that drive of the present invention the 2nd embodiment.
With reference to Figure 12 as can be seen, it comprises following several sections: the tracking coil 136 that is wrapped in 101 two centres of object lens bracing frame, be wrapped in the focusing coil 135 of a left side, above-mentioned object lens bracing frame 101 both sides/right part position, and the tilt coil 137 that twines around the above-mentioned focusing coil 135.Each coil 135,136,137 is all corresponding with multipole magnet.
Here, focusing coil 135 is pushed down trapezoidal shape and is arranged on the outside, and tilt coil 136 is pushed down trapezoidal shape stack and is arranged on inside.Cite an actual example in addition, focusing coil 135 also can be pushed down trapezoidal shape and be arranged on inside, and tilt coil 137 also can be pushed down trapezoidal shape stack and be arranged on the outside.
Below, will be described in detail the 2nd embodiment of the present invention.
(a) among Figure 13 is the magnetic structure synoptic diagram of 3 actuators of expression prior art; (b) be the magnetic structure synoptic diagram of expression second embodiment of the invention.
At first, with reference to Figure 12 and Figure 13 as can be seen, be wound with tracking coil 136, be wound with focusing coil 135 and tilt coil 137 in a left side, both sides/right part position in the centre of object lens bracing frame 101 both sides.That is to say, will fall the winding that superposes successively of the trapezoidal focusing coil 135 and the trapezoidal tilt coil 137 that falls.
Magnetic circuit is changed into the form of coil 135,136,137 shown in (b) among Figure 13 here, by the form of coil 305,306,317 shown in (a) among Figure 13.
That is to say, tilt coil 137 is twined along the inboard of focusing coil 135 respectively.Like this, just focusing coil 135 and tilt coil 137 can be superposeed successively on a left side, the both sides/right part position that is wrapped in object lens bracing frame 101.In this case, at first tilt coil 137 is wrapped on the coil support portion 108.Then, can with focusing coil 135 along the outer felt of above-mentioned tilt coil 137 around.Like this, just can guarantee that tilt coil 137 and focusing coil 135 all are inverted trapezoidal structure.
In this case, focusing coil 135 and tilt coil 137 are wrapped on a left side, the both sides/right position of object lens bracing frame 101.Like this, the center of gravity of object lens bracing frame 101 further descends, and the angle of inclination of trapezoidal tracking coil 136 will further increase.Thereby will cause the top amplitude of tracking coil 136 further to narrow down.
Like this, increase the space, just can will fall the winding that superposes successively of trapezoidal focusing coil 135/ tilt coil 137 by the top amplitude that reduces above-mentioned tracking coil 136.
Figure 14 is the coil and the magnet arrangement synoptic diagram of expression second embodiment of the invention.
As shown in figure 14, magnet 134 has multi-polar magnetic (134a～134d).(134a 134b) is trapezoidal to the polarity in its centre, and they are symmetrical.The polarity of its underpart be dimetric auxiliary polarity (134c, 134d).Like this, the horizontal polarization of magnet 134 (134a, critical surface 134b) is vertical corresponding with the center of tracking coil 136, the vertical polarization (134a of magnet 134,134c) (134b, critical surface 134d) are corresponding with the centre level of focusing coil 135/ tilt coil 137 respectively.Above-mentioned magnet 134 is fixed on the front of yoke plate 103.
If supply with certain orientation and a certain size electric current to each coil 135,136,137, then object lens bracing frame 101 promptly passes through focusing coil 135, tracking coil 136 just by each coil, tilt coil 137 and along focus direction, tracking direction, 3 direction of principal axis such as radiation vergence direction move.
Figure 15 is the focusing coil of expression second embodiment of the invention and the structural representation of tilt coil.
Figure 16 is the focusing coil of expression second embodiment employing and another form synoptic diagram of tilt coil.
Here, promptly trapezoidal in order to make coiling face as shown in figure 15 for the part adjacent with tracking coil 136 constituted, and will fall the certain angle (θ 1) of side coiling face tilt of trapezoidal focusing/tilt coil 135,137.Perhaps as shown in figure 16, trapezoidal for the part adjacent with tracking coil 136 constituted, also can (d1, d11) vertical, (d2 d12) tilts to make its underpart with the top of side coiling face.
[the 3rd embodiment]
Figure 17 and Figure 18 are the situation synoptic diagram of the present invention the 3rd embodiment.Below, will be described in detail the 3rd embodiment of the present invention.
Figure 17 is the structural representation to 3 optical pick-up actuators that drive of the present invention the 3rd embodiment, and Figure 18 is the magnetic structure synoptic diagram of expression third embodiment of the invention.
With reference to Figure 17 as can be seen, it comprises following several sections: the tracking coil 146 that is wrapped in centre, object lens bracing frame 101 both sides, be wrapped in the focusing coil 145 of a left side, above-mentioned object lens bracing frame 101 both sides/right part position, and the tilt coil 147 that twines along the inboard of above-mentioned focusing coil 145.Each coil 145,146,147 is all corresponding with multipole magnet.
Here, focusing coil 145 is arranged on the outside according to falling trapezoidal shape, and tilt coil 146 is arranged on the inboard according to falling trapezoidal shape.Two coils 145,147 are along the winding that superposes of front/rear direction.Cite an actual example in addition, focusing coil 145 also can be wrapped in the inboard according to falling trapezoidal shape, and tilt coil 147 also can be wrapped in the outside according to falling trapezoidal shape.
Below, will be described in detail the 3rd embodiment of the present invention.
Participate in Figure 17 and Figure 18 as can be seen, be wound with tracking coil 146, be wound with down trapezoidal focusing coil 145 and tilt coil 147 in a left side, both sides/right part position in the centre, both sides of object lens bracing frame 101.That is to say, fall trapezoidal focusing coil 145 and fall trapezoidal tilt coil 147 along the fore-and-aft direction winding that superposes.
As shown in figure 18, magnet 144 has multi-polar magnetic (144a-144d), and (144a 144b) is trapezoidal to the polarity in its centre, and they are symmetrical.The polarity of its underpart be dimetric auxiliary polarity (144c, 144d).Like this, the horizontal polarization of magnet 144 (134a, critical surface 144b) is vertical corresponding with the center of tracking coil 146, the vertical polarization (144a of magnet 144,144c) (144b, critical surface 144d) are corresponding with the centre level of focusing coil 145/ tilt coil 147 respectively.Above-mentioned magnet 144 is fixed on the front of yoke plate 103.
If supply with certain orientation and a certain size electric current to each coil 145,146,147, then object lens bracing frame 101 promptly passes through focusing coil 145, tracking coil 146 just by each coil, tilt coil 147 and along focus direction, tracking direction, 3 direction of principal axis such as radiation vergence direction move.
Here, trapezoidal for trapezoidal focusing/tilt coil 145,147 is constituted as mentioned above, can make inboard coiling face, promptly adjacent with tracking coil 146 part constitutes trapezoidal, perhaps constitutes trapezoidal after the distortion.
Adopt 2 or 3 shaft-driven optical pick-up actuators for the present invention, trapezoidal tracking coil can be set, and on a left side/right part position adjacent, twine trapezoidal focusing coil with above-mentioned tracking coil.Simultaneously, as required, the object lens bracing frame can also be set, and trapezoidal tilt coil is twined down in the side of the focusing coil of object lens bracing frame.
By above-mentioned explanation, those skilled in the art can carry out various change and modification fully in the scope that does not depart from the technology of the present invention thought.But, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used 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 modification of the above embodiment.
Claims (14)
1. an optical pick-up actuator is characterized in that, comprises following several sections:
Object lens are fixed the object lens bracing frame that also can move;
Be arranged on the trapezoidal tracking coil of the center, both sides of above-mentioned object lens bracing frame;
Be arranged on above-mentioned object lens bracing frame a left side, both sides/right position fall trapezoidal focusing coil;
Polarity is corresponding with a left side/right of above-mentioned tracking coil, with on the above-mentioned focusing coil/the corresponding multipole magnet of following direction.
2. optical pick-up actuator as claimed in claim 1 is characterized in that:
The narrow top of the bottom amplitude amplitude broad of above-mentioned focusing coil.
3. optical pick-up actuator as claimed in claim 1 is characterized in that:
Above-mentioned focusing coil is to the coil lateral vertical side coiling face tilt adjacent with above-mentioned tracking coil.
4. optical pick-up actuator as claimed in claim 3 is characterized in that:
The angle of inclination of the side of two coils adjacent with tracking coil with above-mentioned focusing coil is identical.
5. an optical pick-up actuator is characterized in that, comprises following several sections:
Object lens are fixed on the object lens bracing frame that the centre also can be moved;
Press the tracking coil of trapezoidal winding in the centre, both sides of above-mentioned object lens bracing frame;
The focusing coil of trapezoidal winding is pushed down in a left side, both sides/right position at above-mentioned object lens bracing frame;
The tilt coil that superposes and twine at above-mentioned focusing coil respectively;
Polarity is corresponding with a left side/right of above-mentioned tracking coil, and with above-mentioned focus point/tilt coil on/the corresponding multipole magnet of following direction.
6. optical pick-up actuator as claimed in claim 5 is characterized in that:
Above-mentioned tilt coil is pushed down trapezoidal shape stack and is wrapped on the above-mentioned focusing coil.
7. optical pick-up actuator as claimed in claim 5 is characterized in that:
Above-mentioned tilt coil is pushed down trapezoidal shape and is twined along the inboard of above-mentioned focusing coil.
8. optical pick-up actuator as claimed in claim 5 is characterized in that:
Above-mentioned tilt coil push down trapezoidal shape along the outer felt of above-mentioned focusing coil around.
9. optical pick-up actuator as claimed in claim 5 is characterized in that:
Above-mentioned tilt coil is pushed down the rear side that trapezoidal shape is wrapped in above-mentioned focusing coil.
10. optical pick-up actuator as claimed in claim 5 is characterized in that:
Above-mentioned tilt coil is pushed down the front side that trapezoidal shape is wrapped in above-mentioned focusing coil.
11. optical pick-up actuator as claimed in claim 5 is characterized in that:
Make the laterally inclined of the coil adjacent with above-mentioned tracking coil for narrow top, the bottom that makes focusing/tilt coil is wide.
12. optical pick-up actuator as claimed in claim 5 is characterized in that:
Above-mentioned focusing/tilt coil to the assigned position bending of above-mentioned tracking coil adjacent windings side.
13. an optical pick-up actuator, be for the object lens bracing frame that makes fixing object lens by the optical pick-up actuator that the multiaxis mode turns round, it is characterized in that:
The magnetic circuit of optical pick-up actuator comprises following several sections: the trapezoidal tracking coil that is wrapped in centre, above-mentioned object lens bracing frame both sides, be wrapped in above-mentioned tracking coil a left side/right part position fall trapezoidal focusing coil, the corresponding multipole magnet of polarity of its 2 polarity and above-mentioned focusing coil and tracking coil, and the yoke plate of fixed magnet.
14. optical pick-up actuator as claimed in claim 13 is characterized in that:
Be wound with focusing coil and tilt coil in the stack of the side of above-mentioned focusing coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100308380A CN101140768A (en) | 2006-09-05 | 2006-09-05 | Optical pick-up device executor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100308380A CN101140768A (en) | 2006-09-05 | 2006-09-05 | Optical pick-up device executor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101140768A true CN101140768A (en) | 2008-03-12 |
Family
ID=39192686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006100308380A Pending CN101140768A (en) | 2006-09-05 | 2006-09-05 | Optical pick-up device executor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101140768A (en) |
-
2006
- 2006-09-05 CN CNA2006100308380A patent/CN101140768A/en active Pending
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| C06 | Publication | ||
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Application publication date: 20080312 |