CN86105002A - The photoscanner - Google Patents

Abstract

Be used for light beam is focused into luminous point on the information carrier, have the photoscanner of object lens with optical axis.It has one can constantly proofread and correct the electromagnetic actuator device of object lens with respect to the information carrier position.This device is equipped with an objective holder, and objective holder has a movably annular magnet around the light shaft coaxle setting, is furnished with magnetic pole at the optical axis end.Drive unit also is furnished with by air-gap and the synergistic all fixedly windings of magnet, and each winding has first sector (-shaped) coil, and this coil has two active coil parts that extend along the parallel magnets edge direction.This scanner also is furnished with one second coil at least, and it is between the active coil parts of first sector (-shaped) coil at least in part.

Description

The photoscanner

The present invention relates to a kind of photoscanner that can control and adjust to the light beam on the recording track that is mapped to the information carrier surface that will scan, wherein, this photoscanner has the object lens on optical axis, and these object lens are equipped with one in order to beam is focused into the lens of an analyzing spot on described surface; This photoscanner also has an electromagnetic actuator device with respect to the position of information carrier in order to continuous correction object lens, on this drive unit, be assembled an objective holder, this objective holder has the ringshaped magnet of a permanent magnetic material that is moving, two ends have this magnet cartridge of magnetic pole on optical axis, the coil of plurality of fixed in this drive unit, also is equipped with and, these coils and above-mentioned magnet can interact on magnetic by an air-gap, and have at least three coil winding; When the annular magnet circumferencial direction was seen, these windings were equidistantly being arranged each other.

From Deutsche Bundespatent No3234288(PHD82.089; Learn a kind of like this photoscanner in this insertion for your guidance).In this known scanner, object lens are fixed in the permanent magnetism axle sleeve that moving, axially excitation, and this axle sleeve has two axle heads as magnetic pole.Two the sector (-shaped) coil parts that fixedly mounting that are flat banana-shaped shape can carry out mutual and with respect to the axial stretching, extension of described axle sleeve, and when passing to electric current in sector (-shaped) coil, the direction of current that then flows through the relation line coil component is opposite.

Utilize this known coil device can produce three three axial power of coordinate and lines and two rotating torques of two axles rotations in the above-mentioned axes of coordinates along the quadrature coordinate system.

Utilize the drive unit of known scanner can obtain all object lens that need actions basically.These motions include a kind of be parallel to objective lens optical axis and in order to moving axially of being mapped to that light beam on the optical disc information carrier surface that is rotating focuses on and two kinds mutually perpendicular move radially and/(or) to orthogonal two axles that rotating and to two kinds of tilting actions of optical axis, the four kinds of actions in back be utilized for tracking spot and do radially and tangential action.

But, this known drive means has a shortcoming, exactly: the magnetic force at coil and magnetic shaft room changes as the moving a kind of like this funtcional relationship of the axial displacement of object lens, so that even when object lens moved apart the little axial displacement in one of center between the winding, this drive unit just no longer can mobile contentedly object lens and reached the needs of needs that light beam is focused on and tracking spot.In fact each winding that is separated far is suitable for moving along optical axis and reaches enough distances, even but the possibility that produces other above-mentioned actions just weakens so soon thus object lens move apart one of center little apart from the time, just no longer can be driven to such an extent that be enough to guarantee that luminous point can the track record track.

The objective of the invention is to create a kind of this paper and start mentioned the sort of photoscanner, be equipped with by this way coil promptly object lens be moved sizable apart from the time, make to focus on required power and required the trying hard to keep of track record track of action and hold constant or near constant.

Photoscanner of the present invention has additional performance, be that each winding is equipped with one first sector (-shaped) coil, it is at the coil component that has two activities from magnet same axial place, and center on magnet and stretch, each in these coil components be positioned at an axial end placing center magnet near; And these two coil components are interconnected by axial other coil component, and have at least one second coil, and it is at least in part between the active coil part of above-mentioned first sector (-shaped) coil.

Scanner of the present invention has a kind of advantage, promptly need only coil by excitation, be enough to that luminous point is focused on and keep focus to the time when object lens move in a big way to the information carrier surface of CD, by coil act on magnet axially and power radially can keep almost constant at least.

Another advantage of scanner of the present invention is: during object lens were axially driven, the efficient of drive unit was very high.This high efficient is because the suitable shape of first sector (-shaped) coil and the result of adjustment, thereby the largest portion of the first sector (-shaped) coil movable part is in the zone of high magnetic field intensity.

The further advantage of scanner of the present invention is at least with regard to its structure length, and objective holder can be done very for a short time.This is very important, because flat objective holder can make the center of gravity of its center of gravity and object lens bead coincide, this just means: can avoid object lens undesirably to be tilted when object lens are moved radially.

A kind of can have this specific character with the good embodiment of the enough control abilities of also providing of plain mode production: promptly have two to be the second sector (-shaped) coil shape in above-mentioned winding, and be second coil that stretches parallel to each other; When axially the seeing of magnet, these mutually each coil in stem for stem second coil have a coil component that stretches towards magnet and along its circumferencial direction and another is from the farther coil component of magnet.

Above-mentioned loop construction of the present invention can provide excitation so that object lens are moved to second sector (-shaped) coil of each winding on the vertical direction of optical axis, and first sector (-shaped) coil of each winding is carried out excitation so that object lens can be moved along optical axis.If necessary, whole first sector (-shaped) coil also can be used for making object lens to tilt around the axle perpendicular to optical axis.This must be handled so that light beam is focused into luminous point and is mapped on the information carrier surface of CD with regard to first sector (-shaped) coil that means drive unit; Second sector (-shaped) coil that means drive unit must make luminous point track record track radially and tangentially for the selection effect that adapts to first sector (-shaped) coil.Should be pointed out that loop construction described here can entirely use with a simple axial magnetized magnet together.

The feature that another kind of good embodiment has is: each winding has second coil of two picture second sector (-shaped) coils, these two coils are mutually side by side from axially seeing of magnet, and each coil of this second coil has two active coil parts from the identical axial distance of mobile, and can stretch around mobile.A coil in two active coil parts is to be adjacent to magnet, and is connected to another active coil part by the other coil component of locating at an angle with magnet, and another active coil part is positioned at the opposite of the magnetic pole of magnet one end.

Second sector (-shaped) coil that is occurred in this embodiment all is in the good area of magnets magnetic fields with the overwhelming majority that causes these sector (-shaped) coils by carrying out shaping and the adjustment with respect to magnet.This can be axially and use the drive unit of minor diameter more under the radial drive situation and reach high efficient with regard to meaning.

In another embodiment, magnet comprises the permanent magnet parts of axial array; Each winding comprises second coil of a ring-type, and can stretch around magnet on a sagittal plane.

In the prior art, be placed in the coil component on the same distance of the magnet outside, now also can be with respect to the control system activity, and former, coil component can only place the inboard movable of magnet.This is according to a kind of like this fact, promptly under the situation of the magnet that is made from multiple components (wherein each magnet component is differently magnetized), various field regions are arranged, in this field region, not only in the past at the movable part of inboard, and its right outside inertia parts in the prior art all can be movable.Because make the outer coil parts than the more close magnet of outer coil in the past now, the diameter of device becomes littler, other parts can be installed in its space.

In addition, the toroid winding on the sagittal plane, center mainly can produce in order to magnet is made to focus on the axial force of adjusting.This coil preferably can produce the radial effect power that magnet gets on that affacts.During coil magnetization, because the segmentation of this coil component just can be used motive power more regularly.

The photoscanner of Gou Chenging can be used as a kind of three three shaft-type governors that are mutually the component motion at right angle that have like this.This has just simplified coil system greatly and has kept best radial and axial acting force.

In yet another embodiment of the present invention, be used to control and adjust and be mapped to the object lens that the photoscanner who is scanned the light beam on the surface recording track has a band optical axis, on these object lens, be equipped with one in order to light beam is focused on the objective lens that becomes the scanning spot of injecting above-mentioned surface, in addition, also have one in order to the electromagnetic actuator device of continuous correction with respect to the object lens position of information carrier, this drive unit disposes the objective holder of these object lens, this objective holder have one with optical axis with arranging, ring bodies movably, each end of this ring bodies is equipped with magnetic pole, and includes one folded one permanent magnet parts in the axial direction; And this drive unit also is equipped with the plurality of fixed coil, and these fixed coils can utilize magnetic to interact through air-gap and above-mentioned magnet, and these fixed coils comprise at least 3 fan-shaped windings, and each winding has two sector (-shaped) coils; From the circumferencial direction of magnet, these windings are equidistantly to arrange mutually and with arranging; This photoscanner's feature is: each axial equidistant at the distance magnet of each sector (-shaped) coil has two movable coil parts and stretches around magnet, in these coil components one be positioned at the magnet center position near, and another coil component places axially towards the center of magnet, but these two coil components are connected by coil components of axially-movable.To this scanner, except mutually perpendicular action component, also can obtain centering on two rotating torques of two axles in these.Therefore, can provide a kind of five shaft-type governors.

According to another embodiment of the present invention, one can stretched on the circle of magnet center on the sagittal plane at the toroid winding between the described sector (-shaped) coil of above-mentioned winding.The scalable axial action component of this toroid winding.

According to another embodiment of the present invention, the sector (-shaped) coil of all fan-shaped windings and toroid winding all are made up of the laminated conductor on cylindrical shape carrier (around magnet).Like this, coil just can be done very flat and can be on cylinder frame.Technical being easy to of this coil winding made, and is very desirable and suitable aspect large-scale production.

According to another embodiment of the present invention, non magnetic a, soft magnetism is being set between the permanent magnet parts of magnet or also can be the intermediate member that permanent-magnet materials is made.

If this intermediate member is a nonmagnetic substance, then independent is radially just more remarkable with axial dynamic action.If this intermediate member is the magnetic ferrites magnet, then radial component just can increase.If this intermediate member is a permanent-magnet materials, radial component even can increase greatlyyer then.In a word, this just means that just can obtain this device (structure of magnet/coil) by the insertion intermediate member does not adorn the performance that intermediate member just can not get.

According to another embodiment of the present invention, magnet assembly forever is magnetized in the opposite direction.This mode of magnetization is the easiest realization technically.

According to an alternative embodiment of the invention, intermediate member is pointed in the arctic of magnet assembly, and its lateral wall is pointed in the arctic of intermediate member.Otherwise, equally also the arctic can be pointed to conversely, so that the arctic points in axial direction end of parts, and its madial wall is pointed in the arctic of intermediate member.

To be elaborated to various embodiments of the present invention by accompanying drawing below, those accompanying drawings illustrate:

Fig. 1, photoscanner's of the present invention part principle explanation.

Fig. 2 is according to the exploded view of first embodiment of drive unit of the present invention.

Fig. 3, the vertical view of drive unit shown in Figure 2.

Fig. 4 is along the sectional view of the IV among Fig. 2-IV profile line.

Fig. 5 is according to the exploded view of second embodiment of drive unit in the scanner of the present invention.

Fig. 6, the longitudinal section of drive unit shown in Figure 5.

Fig. 7 cutd open the photoscanner's that two permanent magnetic part magnets are housed sectional view, and this magnet is exactly an objective holder, and a focusing objective len is housed above, and in the zone of magnet axial end, will there be winding in its outside; And a toroid winding is housed in the zone of the radial central planes between winding.

Fig. 8, simplified schematic key diagram embodiment illustrated in fig. 7.

Fig. 9, improvement project embodiment illustrated in fig. 7, among the figure only with a winding, on the one hand, its along the circumferential direction the coil component of cabling be arranged in the axle head zone of magnet, and on the other hand, in another axle head zone, toroid winding is placed on the radial central planes between the coil component of end once more.

Figure 10, photoscanner's shown in Figure 9 simplified schematic key diagram.

Figure 11, the magnet of forming by some magnetic parts.

Figure 12, the key diagram of the sector (-shaped) coil of winding shown in Figure 10, and each driving force of sending of this sector (-shaped) coil.

Figure 13 cutd open improved, as to have the photoscanner of a coil and magnets magnetic fields sectional view.

Figure 14 has the improvement project of two parts magnets of an intermediate member between two magnetic parts.

Figure 15, winding construction and be arranged in the schematic illustration of the magnet structure in the winding as shown in figure 13.

Figure 16, the dynamic effect of winding sector (-shaped) coil and generation thereof as shown in figure 10.

Scanner according to Fig. 1 is equipped with a radiation source 1, diode laser for example, a collimator lens 3 and object lens 5 that have optical axis 5A, object lens are set on the objective holder 7 of an electromagnetic actuator device, (this electromagnetic driver is prepared to describe in detail subsequently).Collimator lens 3 and object lens 5 can have some lens elements, but preferably are made up of the single lens element that has an aspheric surface refracting surface at least.In this device, object lens only are made up of the single objective lens that by copying is produced, and this objective lens is equipped with an annular mirror 9 that is used for position detecting device (not describing in detail at this).The HOII P 8501665(PHN11.416 of this position detecting device; Describe in this insertion for your guidance).

The collimated instrument lens of being supplied with by radiation source 13 of divergent beams convert the parallel beam that can be full of object lens 5 apertures fully to.These object lens are focused into a radiation light point V that deflection is limited with light beam, and this luminous point for example is 1 micron at the diameter of information sides on Figure 11 of disc-shaped information carrier 13, information sides in Fig. 1, its sub-fraction is shown with radial section.Information is divided into many concentric circles recording tracks or quasiconcentric circle recording track, and they form a kind of spirality recording track together.This information comprises many detectable information areas of using up, and between these information areas zone line is arranged.Best, the top of these information sides 11 close information carriers 13 is so that make light beam b just pass through the residuite 17 of information carrier before it arrives information sides.This information sides preferably can reflect luminous, so that light beam can be reflected along the radiation source direction.

Under the situation of the information carrier that rotates, modulate with the time from the light beam that information sides reflects, modulate and be actually according to the order of block of information in the recording track that is read out and mesozone.Open for the beam separation that the light beam that will modulate and radiation source send, the decoupling element 19 such as the prism-like parts is inserted in the radiation path, and its parting plane 21 at least can be the partial reflection beam reflection to radiation-sensitive detector 23.This detecting device 23 converts modulated beam of light to a kind of electric signal, and this electric signal can be processed into according to being stored in that the pattern of information is decided to be in the information carrier with known method, the signal of visible or audible or another way.

The right side of Fig. 1 is painted with a quadrature coordinate system XYZ, and its initial point O must be considered to be on the M point, thereby its Z axle overlaps with the basic light L of light beam b.The Z axle can stretch in the axial direction, and this direction just object lens for light beam b being focused into the mobile direction of luminous point V.X-axis and Y-axis can be respectively done radially and tangential stretching, extension with respect to the rotating shaft of information carrier.Because luminous point V is the recording track on the trace information rotating disk as far as possible critically, so object lens 5 must along the X-axle and the Y-axle move as straight line and can rotate arbitrarily around these axles.Object lens are also named along moving of Z axle and focus on action, and other actions are also named tracking and time error than direct action.

Fig. 2 to 6 has described some kinds of electromagnetic actuator devices in the cards of scanner of the present invention in detail.In principle, every kind of drive unit all comprises an annular magnet that is flexibly hanging and several fixed coils of arranging around magnet, and these coils are formed three or four groups.Magnet is ring-type or sleeve-like, and is made by permanent magnetic material.Each coil in groups is positioned at the specific part of magnets magnetic fields.In order to make object lens can carry out above-mentioned required action and unlikely generation spurious resonance, object lens are installed in magnetic force in this drive unit, the object lens of scanner and objective holder be as an aspect like this, and all the other elements of scanner are as on the other hand, and the two does not have actual contact.

Fig. 2,3 and 4 illustrates a kind of drive unit that has magnet 200, this magnet of pointing out with arrow as Fig. 4 by axial magnetized, the meaning is to have formed South Pole Z and arctic N at the axial two ends of magnet 200.It is preferably by magnetic material that neodymium-iron-boron and samarium-the cobalt energy content is high makes such as containing.

Magnet 200 is formed the objective holder 7 of object lens 5 with supporting ring 202.On support plate 208, several coils are arranged around magnet 200.This coil is divided in the present embodiment by three windings of 204,205 and 206 expressions.This 204,205 and 206 winding is being arranged mutually contiguously, also forms a housing around the intimate closure of magnet 200 as seeing on the circumferencial direction of magnet 200 together.The winding that four or more also can be set in graphic extension is to replace this three windings.Each winding 204,205 and 206 is equipped with sector (-shaped) coil 204A, a 205A and 206A accordingly, they are formed by this way and are provided with and make two active coil part 204A1,205A1 in three sector (-shaped) coils or 206A1 near the magnet location, and in fact are positioned at the zone that the magnetic line of force is mainly radially derived.Therefore when sector (-shaped) coil 204,205,206 during by excitation, they just can be applied to the magnetic force along the generation of Z axle on the magnet, so that for the mobile object lens 5 of focusing, away from center shown in Figure 4.Be fixed accordingly coil component 204A2,205A2 or 206A2 of active coil part above-mentioned connects in couples.

204, each winding of 205 and 206 also be equipped with the 2nd sector (-shaped) coil 204B, the 205B of two stretching, extensions parallel to each other and 206B, these sector (-shaped) coils to be made into banana-shaped and be provided with accordingly the intimate above mentioned first sector (-shaped) coil 204A, 205A and 206A.Each the second sector (-shaped) coil 204B, 205B and 206B have active coil part 204B1, a 205B1 and 206B1, these coil components are towards magnet 200, and being arranged in the part magnetic field of magnet 200, the magnetic line of force in this magnetic field mainly is an axial distribution.Therefore, when electric current flow through second sector (-shaped) coil, it mainly can be applied to radial magnetic force one and produce on the magnet 200 of torque under certain field coil combined situation.Situation from above may be very clear, when the CD of rotation is read, by selecting the second magnetic coil 204B, the action of 205B and 206B, object lens 5 just can be moving along X-axis and y-axis shift, and tilting, so that track record track and carry out time adjustment around X-axis and Y-axis.

It is as follows that brief description is only made in identical with the drive unit recited above basically event with the electromagnetic actuator device shown in 6 of Fig. 5 once more: drive unit is equipped with magnet 200; In this drive unit, fixing the seat 202 that has object lens 5, it also is equipped with three magnetic windings 504,505 and 506, and these windings are arranged around magnet 200 in the mode of having described.In order to fix these coils, need a support, and the support plate 208 of support is illustrated schematically in the drawings.Each winding in the winding 504,505 and 506 includes 3 sector (-shaped) coils, promptly is one first sector (-shaped) coil 504A, 505A and 506A accordingly and is two second sector (-shaped) coil 504B, 505B and 506B accordingly.As for its shape, position and effect, the first sector (-shaped) coil 504A, 505A and 506A be with the foregoing description in the first sector (-shaped) coil 204A, 205A identical with 206A, thereby no longer describe in detail.When on focus direction, seeing, two second sector (-shaped) coil 504B, 505B of each winding in the winding 504,505 and 506 and 506B be in series arrange strong.Each coil among sector (-shaped) coil 504B, 505B and the 506B is more or less as wing or arcuation, and be equipped with two active coil part 504B1,505B1 and 506B1, its each coil component to be placed in that the magnetic line of force in this magnetic field mainly is to stretch abreast with the Z axle in the magnetic field of magnet 200.Shape and the corrective action of the second sector (-shaped) coil 504B, 505B and 506B, the spinning movement that can move and center on X, Y-axis by the straight line along the X of magnet 200, Y-axis makes the time adjustment action of its tracking that can determine track rapidly and accurately and object lens.

In described embodiment, for the purpose of complete, should be mentioned that the tilting action that object lens center on described X, Y-axis can reach by the combined action of first sector (-shaped) coil, second sector (-shaped) coil or first and second sector (-shaped) coils.

In photoscanner shown in Figure 7, the focusing objective len 601 of a with dashed lines signal is set in the magnet 603.This magnet includes two magnetic part 603a and 604b.These two parts 603a and 603b oppositely are magnetized in the axial direction, are indicated because the magnetization shown in arrow 605a and the 605b just forms the magnetic field by the magnetic line of force 607 indications in magnet 603 outsides by arrow 650a and 605b.

Winding 613,615 is placed in the zone of axle head 609,611 of magnet 603, and around magnet arrangements, and a toroid winding 619 is placed in the zone of the joint face 617 between magnet assembly 603a and the 603b, around magnet arrangements.Total coil device structure schematically is illustrated among Fig. 8.For purposes of illustration, whole winding is drawn significantly.In a certain practical plan, coil device and sleeve length have only several millimeters high.

Fig. 8 just schematically illustrates: round magnet 603, winding 613 and 615 are set, toroid winding 619 is housed between them.Winding 613 and 615 all is mutual identical on design and structure.

Each winding of coil winding 615,613 includes the plurality of sector coil, and they are respectively: 615.1,615.2,615.3,615.4 or 613.1613.2,613.3,613.4.Each sector (-shaped) coil itself forms each section of a cylinder frame, and these sections can be formed a cylinder frame together on its circumferencial direction.For this reason, each sector (-shaped) coil itself, 613.1 to 615.4 include two arcuation coil components, and they are 613a, 613b and 615a, 615b accordingly.Coil component 613a that this is corresponding and 615a form the compound coil ring on a top together, and bottom compound coil ring of the common composition of all coil segment 613b or 615b.All coils parts 613a, 613b have identical camber with 615a, 615b, and all near equidistantly in assembly axis 621.Each sector (-shaped) coil with regard to 613.1 to 615.4, coil component 613a and 613b and 615a and 615b all interconnect by abutment ring 613c and 613d and 615c and 615b.The axle 621 of these abutment rings and device in a certain direction or parallel.In fact these abutment rings 613c, 613d and 615c, 615d are unessential to the control of device, and coil component 613a and 613b, 615a and 615b jointly can help to control the position of magnet 603 in coil device.By the not same-action of each sector (-shaped) coil itself, magnet 603 is moved on X, Y, Building Z parameter, and can rotate around two axles in these.

Fig. 9 and Figure 10 illustrate the scanner of a simplification, wherein have only fan-shaped winding 715 magnets 603 to include two magnetic part 603a and 603b once more, and they are at axle head 609 and 611 places, and the direction of pressing arrow 605a and 605b is by axial magnetized.Two magnetic part 603a and 603b are communicated with one another along a surface 617.Lens 601 are set at the inside 623 of magnet 603 once more.And the magnetic field of magnet 603 produces the magnetic line of force 607.

Fan-shaped winding 715 is arranged around magnet 603, and coaxial with it.This winding 715 includes (for example) four sector (-shaped) coils 715.1,715.2,715.3 and 715.4.Each sector (-shaped) coil itself is formed each section of cylinder frame, and fuses on the circumferencial direction of cylinder and form a cylindrical skeleton.This cylinder frame surrounds magnet 603.Each sector (-shaped) coil itself 715.1 to 715.4 has two pitch of the laps parts 715a and 715b.Coil component 715a and 716b fuse in the zone of upper end 611 and lower end 609, surround compound coil ring upper and lower end 611 and 609 and that keep a determining deviation with composition.Coil component 715a and 715b all have same camber, and are close to the spacing that equates apart from assembly axis 621.The coil component 715a of sector (-shaped) coil 715.1 to 715.4 and 715b are connected ring 715c and 715d is communicated with in their each end.The trend of these abutment rings 715c and 715d is to walk abreast with assembly axis 621, thereby also is axial.

Toroid winding 619 is arranged between coil component 715a and the 715b.This toroid winding and each sector (-shaped) coil can be controlled by an electronic controller respectively.And 619 of toroid windings are to play regulating action on the Z direction in the axial direction, and as required, coil component 715a and 715b also can play regulating action on the direction of X and Y-axis.

Figure 11 illustrates the magnet 703 that comprises three magnetic part 703a, 703b and 703c.Equally, magnetic part 703a and 703b are for good and all magnetized in the opposite direction, are illustrated by magnetization arrow 605a and 605b among the figure.Permanent magnetism intermediate member 703c is magnetized along the direction of inwall 623, and this direction is illustrated by arrow 625.According to this direction of magnetization, the arctic of parts 703a and 703b is located in the zone of axle head 609 and 611, and the arctic of intermediate member 703c is positioned at towards inwall 623 places.In the embodiment of magnet shown in Figure 11 703, adopted in conjunction with Fig. 9 and 10 illustrated coil arrangement modes.Therefore, have only the coil component 715a of sector (-shaped) coil 715.1 to 715.4 and the zone that 715b is arranged in axle head 609 and 611.

Figure 12 is by means of a sector (-shaped) coil 615.1 itself, utilizes some arrows 629 to illustrate when one when having electric current to flow through, derive from the acting force of each coil component 715a and 715b and abutment ring 615c and 615d in the direction of arrow 627.Clearly the acting force of abutment ring 615c and 615d generation is cancelled each other.This just means that the acting force that abutment ring produced of cabling can not increase from being parallel to assembly axis, can not reduce the control action to magnet again.The situation of coil component 615a and 615b is just different, and the arrow that produces from these coil components shows: when electric current arrow 627 directions flow through, the acting force of these coil components was outside.If electric current flows through coil 615.1 with opposite direction then acting force will be inwards.So, just can realize adjusting to the magnet of coil device the inside by the suitable effect of each coil component.According to shown in Figure 12, Fig. 9 comprises the arrow 631 and 633 of expression from the direction of the power of each coil component generation itself.Among Fig. 9+the b arrow represents flow direction.

Photoscanner's coil 613.1 to 613.4; 615.1 to 615.4; 715.1,715.4 and 619 can both with thin-film conductors around make such as resin-bonding paper etc. form on the insulating concrete cylinder 635.A kind of like this structure shown in Fig. 8 and 10 is simply to be suitable for mass-produced.

The focusing objective len 801 that is illustrated by the broken lines in Figure 13 is set on the inside 802 of magnet 803.This magnet comprises two interconnected magnetic part 803a and 803b, and for example, they are by surfacewise 804 and gluing live.Represent with the magnetic line of force 807 around the magnetic field that magnet 803 forms.Because direction of magnetization is opposite, so the arctic of magnetic part 803a and 803b is in the zone of axle head 809 and 811.

Two fan- shaped windings 813 and 815 are around magnet 803, and arrangement separated by a distance is so that magnet 803 can move freely.Fan- shaped winding 813 and 815 almost surrounds axle head 811.

Illustrate as Figure 14, magnet 903 also can comprise two magnetic part 903a and 903b, between these two parts an intermediate member 903c is arranged.Among the embodiment in Figure 14, the mode of magnetization of this embodiment is selected the mode of magnetization such in the image pattern 13 for use, and magnetic part 903a and 903b are magnetized along the direction of axle head 809 and 811.In the case, intermediate member can magnetize on its inwall 817 directions.These direction of magnetization mean: the arctic of magnetic part 903a and 903b is at axle head 809 and 811 places, and the intermediate member 903c arctic is wall 817 places within it.The embodiment in Figure 14, fan-shaped winding 813 and 815 arrangement be with Figure 13 in the arrangement of these fan-shaped windings be identical.

Figure 15 utilizes a kind of synoptic diagram that stretches in the axial direction to show the coil arrangement that centers on magnet 803.Magnet 803 only with magnetic part 803a and 803b with and axle head 809 and 811 illustrate.Fan-shaped winding 813 and each winding of 815 include four sector (-shaped) coils.Therefore fan-shaped winding 813 comprises sector (-shaped) coil 813.1,813.2,813.3,813.4.Fan-shaped winding 815 comprises sector (-shaped) coil 815.1,815.2,815.3,815.4.Each sector (-shaped) coil 813.1 to 815.4 is configured to the part of a cylinder frame.All sector (-shaped) coils (813.1 to 813.4 and 815.1 to 815.4) are compensation mutually in the axial direction when being combined into two cylinder frames around magnet 803.

Each sector (-shaped) coil 813.1 to 813.4 or 815.1 to 815.4 itself comprises coil component 813a same bending and nose balance, 813b and 815a and 815b accordingly.Coil component 813a, the 813b of all sector (-shaped) coils 813.1 to 815.4 and 815a, 815b and assembly axis 821 are equidistant, so all magnet 803 is had a kind of control action.

The coil component 813a of all single coils and 816b and 815a and 815b are accordingly by abutment ring 813c be that 813d or 815c and 815d are connected mutually.These abutment rings 813c is parallel with assembly axis with the trend of 813d or 815c and 815d.The abutment ring of contiguous sector (-shaped) coil is back to back mutually.Will illustrate that as following these abutment rings can and be regulated magnet 803 to control hardly and produce any influence.

Figure 16 shows the principle schematic of the sector (-shaped) coil 813.1 of the sector (-shaped) coil 813.1 to 815.4 that can represent all uses.Just as shown in Figure 15, these sector (-shaped) coils include around assembly axis 821 and crooked coil component 813a813b, and these coil components are connected mutually by abutment ring 813c and 813d.Electric current can flow through sector (-shaped) coil 813.1 along the direction of arrow 823.The magnetic force that consequently makes coil component 813a is directed outward and downward, and the magnetic force of 813b is meant to the inside and downward.The magnetic force of abutment ring 813c and 813d is along the circumferential direction arranged respectively.The figure of such power shows that abutment ring 813c and 813d cancel each other around the magneticaction of single sector (-shaped) coil itself, thereby is inoperative.And the magneticaction of coil component 813a and 813b can be used for being applied on the magnet and starts to control to make and use on the other hand.

By means of arrow 825 and 827, Figure 13 has drawn the magnetic force that produces from a sector (-shaped) coil of fan-shaped winding.Thereby just can obtain to affact the magnetic force of magnet 803.+ b arrow shows the magnetic flux figure along the magnetic line of force.

If all coils 813.1 to 815.4 all dressed up such as with thin-film conductors around to the surface 829 of the insulating paper cylinder 831 of resin viscose glue, shape for example shown in Figure 15; Then this photoscanner's coil arrangement structure is particularly suitable for large-lot production.

Claims (11)

1, be used to control and adjust the photoscanner of the light beam of the recording track that is mapped to the information carrier surface that is scanned, it is characterized in that: this scanner has these object lens of object lens that have an optical axis and is being equipped with one and is used for light beam is focused on the objective lens that becomes described lip-deep luminous point; Wherein this scanner also has one and is used for constantly proofreading and correct the electromagnetic actuator device of object lens with respect to the information carrier position, wherein drive unit is equipped with an objective holder, this objective holder has a movably annular magnet that is provided with light shaft coaxle, this magnet is equipped with magnetic pole at axle head, and wherein drive unit also be equipped with by an air-gap with above-mentioned magnet can synergistic fixed coil on magnetic and have three windings at least, these windings are being arranged as seeing on the circumferencial direction of magnet one by one with separating equidistance, wherein each winding is equipped with first sector (-shaped) coil that has two quilts at the movable part that equidistantly axially separates in magnet and stretch around it, wherein these coil components are each positioned at the contiguous place of an axle head of magnet placed in the middle, these two coil components are fused by other axial line coil component, and wherein have one second coil at least, this second coil is between the active coil part of above-mentioned first sector (-shaped) coil at least in part.

2, photoscanner as claimed in claim 1, its feature has two to be designed to second sector (-shaped) coil and to be parallel to each other and second coil that stretching side by side when axially the seeing of magnet as for: each winding in the wherein said winding, and each second coil has the coil component and the coil component that can further move apart magnet that can stretch towards magnet on the magnet circumferencial direction.

3, photoscanner as claimed in claim 1, it is characterized in that: in each winding, have two axles at magnet when looking up be side by side be second coil of the second sector (-shaped) coil shape, each second coil has active coil part equidistant with magnet axis and that can stretch around magnet, an active coil part next-door neighbour magnet in the active coil part, and further being connected to another active coil part with magnet coil component at angle by one, this second active coil part is corresponding to another magnetic pole of magnet.

4, photoscanner as claimed in claim 1, it is characterized in that: wherein magnetic part overlaps each other in the axial direction, wherein at each winding coil shape, and second coil that can be on the sagittal plane stretches around magnet is ringwise arranged.

5, be used to control and regulate the photoscanner who is mapped to the light beam on the information carrier surface recording track that is scanned, it is characterized in that: this scanner has the object lens of a band optical axis, these object lens are equipped with an objective lens, in order to light beam is focused into an above-mentioned lip-deep scanning spot; Its feature also is: this scanner has one and is used for constantly proofreading and correct the electromagnetic actuator device of object lens with respect to the information carrier position, wherein this drive unit is equipped with an objective holder, wherein this objective holder has a movably ring bodies, this ring bodies is set to and light shaft coaxle, and this ring bodies is equipped with magnetic pole and is made up of the permanent magnetic part of axial overlap at its two ends, and wherein this drive unit also be equipped with by air-gap can with described magnet synergistic fixed coil on magnetic, and have three fan-shaped windings at least, each winding has two sector (-shaped) coils; Wherein these windings are being arranged one by one, see at the circumferencial direction of magnet and to be separated equidistantly, wherein each winding itself has two from the equidistant active coil part that also can center on its stretching, extension of magnet axial, one of these two active coil parts be positioned at an axle head of magnet placed in the middle near, and another parts can move axially to magnet center, and these two coil components are communicated with by coil component vertically.

6, photoscanner as claimed in claim 5 is characterized by: one of them toroid winding, and it is positioned between the sector (-shaped) coil of above-mentioned winding, and it can stretch around magnet center on a sagittal plane.

7, as the photoscanner of claim 4 to 6, it is characterized by: the sector (-shaped) coil of wherein all fan-shaped windings and toroid winding by on the cylinder-shaped bracket that surrounds magnet around thin-film conductors formed.

8, as one of claim 4 to 8 or more than one photoscanner, it is characterized in that: one of them is nonmagnetic, soft magnetism or also can be that the intermediate member of permanent magnetism is set between the permanent magnetic part of magnet.

9, as the one or more optical devices of claim 1 to 5, it is characterized in that: the parts of magnet are for good and all magnetized by reverse direction.

10, as the optical devices in the claim 9, it is characterized in that: wherein the arctic of magnet assembly all is to be oriented in the intermediate member direction, and the arctic of intermediate member is towards its outer wall.

11, optical devices as claimed in claim 9 is characterized in that: wherein the arctic of magnet assembly all is to be directed to axle head, and its inwall is pointed in the arctic of intermediate member.

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