CN1949640A - Voice coil motor and method for controlling displacement by magnetic spring force - Google Patents

Abstract

The invention discloses a voice coil motor and a method of implementing displacement control by magnetic spring load, especially a micro voice coil motor applicable to high reproducibility displacement control, comprising a magnetic circuit part and a circuit part, where the magnetic circuit part is used to generate a magnetic field and the circuit part comprises at least a coil and at least a magnetic conductor, where the coil is exerted with a current to be able to generate a driving force and supplies the driving force to a closed magnetic circuit of the magnetic field to generate a positive coupling force; besides, the design of the magnetic conductor can provide a magnetic spring load. And it can further comprise a suspended supporting part, characterized in using the positive coupling force to be able to achieve the purpose of prepressing the suspended supporting part to eliminate dip angle and back lash as moving.

Description

A kind of voice coil motor and use magnet spring power are reached the method for displacement control

Technical field

The present invention relates to a kind of voice coil motor, a kind of method that makes voice coil motor have magnet spring power, and use magnet spring power to reach the method for displacement control, especially refer to a kind of microminiaturized voice coil motor that can be applicable to high reappearance displacement control.

Background technology

Existing voice coil motor, as shown in figure 29, it comprises a fixing magnetic circuit component and a movable circuit block.Wherein this magnetic circuit component is by yoke 29011, a lower yoke 29012 on one and multi-disc magnet 29013,29014 is affixed on the inner face of lower yoke on this and keep an air gap 2904 to constitute magnetic confining field, this circuit block only is made of a coil 2903, place above-mentioned air gap 2904, when coil 2903 passes to electric current, this electric current can produce a thrust with the magnetic field reciprocation in the air gap 2904.For coil 2903 is kept in air gap and magnet 29013,29014 have the parallel motion of uniform gap, multiple clamping guidance mode is arranged, one is for using a precision linear slide rail, its slide section 29051 is rigidly connected with coil 2903, and slide rail portion 29052 is a fixture, because this slide section 29051 includes the rolling steel ball 29053 of mechanical precompressed, so can keep this coil 2903 and this magnet 29013,29014 contactless parallel sliding, though its motion fidelity performance is excellent, but the cost of this linear slide rail is too high and microminiaturized defectiveness, and this is to real in infeasible under the volume production prerequisite that is applied to the portable consumer electronic product.

In addition, use above-mentioned existing voice coil motor to position control, first kind of way is the closed-loop path Position Control, it uses a position transducer, cooperate the feedback controller that comprises ratio, differential, integration, make the moving part of voice coil motor can reach desired position control, though this method positioning performance excellence, but consumer electronics for the cost structure sensitivity, the extra cost of position transducer and feedback controller, compare following second kind of voice coil motor that does not need the open circuit displacement control of position transducer and feedback controller, then seem and have no competitiveness.

Second kind is open circuit displacement control, as the existing Optical devices short stroke voice coil motor of focusing automatically that is used for, because the program of focusing only requires the reappearance of displacement automatically, not too require the accurate positioning degree of absolute position, therefore, can utilize an elastomer such as plate shell fragment or Siping City's row steel wire to produce Displacement Feedback power, its detailed principle as shown in figure 30, in a coil 3001, pass to electric current, this function of current is formed the magnetic field of being given birth to and is produced a propulsive force in magnetite 3002 and yoke 3003, make this coil 3001 begin to quicken displacement, a plurality of branches brace 3004 deformation that this displacement meeting constitutes elastomer produce a reverse elastic force, when this reverse elastic force and this propulsive force reach balance, this coil 3001 stops to quicken, have certain damping as this voice coil motor, then can reach the displacement control effect of open circuit (not needing position feedback); In addition, suppose this a plurality of branches brace 3004 for isometric, and have consistent elastic force constant and deformation behavior that according to the parallel rod principle, this coil can be reached aclinic straight-line displacement.But in fact, use elastomeric voice coil motor, its a plurality of shell fragment branch brace 3004, as keeping consistent elastic force constant and deformation behavior, really reach the effect of parallel rod when making the voice coil motor displacement, and do not produce the inclination angle with displacement, the volume production that reach the high percentage of A-class goods is difficult really; In addition, above-mentioned plate shell fragment or Siping City's row steel wire are except that providing elastic force, the function that also must possess conduction, to supply with coil one electric current that connects, the normally scolding tin welding of the method for this connection, this is more unfavorable to keeping consistent elastic force constant and deformation behavior, and solder joint is welded in the elastomer of frequent deformation, and the possibility that comes off is arranged.

In addition, this has elastomeric voice coil motor, when being applied to portable type camera shot equipment, because its plate shell fragment is extremely thin, must be by falling the anti-test of falling, but, when the angle that falls bump makes gravity that the motor moving part produced not with the default deformation direction of shell fragment in the same way the time, to cause partly shell fragment branch brace 3004 that the phenomenon of torsional deformation is arranged, the lighter causes the excessive permanent deformation of Root Stress of this shell fragment branch brace 3004, worsen at inclination angle when making displacement, and fracture will take place weight person lost efficacy the voice coil motor positioning function, and above shortcoming will make anti-the fall reliability of application said apparatus when portable type camera shot equipment reduce.

In addition, these have elastomeric voice coil motors such as plate shell fragment and belong to a kind of ultralow damping system, the instantaneous energy of being given birth to during displacement can be stored in a plurality of shell fragment branch brace 3004, even when the motor propulsive force is equilibrated at shell fragment deformation power and arrives default displacement, voice coil motor only stops to quicken and can't stop at once moving, must just can settle out to consume above-mentioned instantaneous energy through the concussion of certain hour, therefore need usually to absorb instantaneous energy to be shortened the concussion time by adding the root of damping glue in shell fragment branch brace 3004, the interpolation of damping glue not only increases produces man-hour and material cost, and the prolonged qualitative change that produces of damping glue also can influence the ability that damping is provided.

Summary of the invention

The problem to be solved in the present invention provides a kind ofly reaches the problem of aclinal motion in order to keep homogeneous elastic force constant and deformation behavior on the elastomeric material volume production that solves the elastomer voice coil motor, and the anti-reliability of falling that strengthens this voice coil motor, simultaneously can exempt the interpolation of damping glue again and reach the characteristic of high damping, be necessary to invent a kind of high-reliability voice coil motor of nonelastic body, aclinic high reappearance displacement is guaranteed in its decapacitation, also can reach the displacement controlled function of open circuit high damping.

Voice coil motor of the present invention, for utilizing simultaneously in conjunction with the circuit block that comprises coil and magnetic conductor, magnetic circuit component with magnetite and/or yoke combination, produce a magnetic loop commissure, can produce a forward coupling power, utilize this forward coupling power can reach the precompressed guiding, inclination angle and play when moving to eliminate voice coil motor; Moreover, can utilize the design of this magnetic conductor, make when between foregoing circuit parts and magnetic circuit component relative displacement being arranged, the magnetic resistance of this magnetic loop changes the magnet spring power of generation with displacement, is used for replacing the existing elastic force that elastomer produced that uses; In addition, the ohm that utilizes this magnetic conductor to combine with a conductive metal sheet to increase vortex flow decreases, and can effectively consume instantaneous energy, promotes damping characteristic; The present invention is directed to this voice coil motor, how to adjust magnet spring force constant, no current balance point, reach and strengthen lateral rigidity, carry out magnetic structure and the possible embodiments explanation of suspending support component in midair, the method that the magnet spring of elaboration utilization simultaneously power is carried out displacement control.

Voice coil motor of the present invention comprises a magnetic circuit component and a circuit block:

Wherein this magnetic circuit component comprises at least one magnetite, is used for producing a magnetic field.

This circuit block wherein, comprise at least one coil, place this magnetic field and keep at least one air gap setting with this magnetic circuit component, this at least one coil passes to the propulsive force that an electric current and this at least one magnetic field reciprocation produce at least one direction, the relative motion that makes this magnetic circuit component and this circuit block can reach at least one direction.

This circuit block more comprises at least one magnetic conductor, and this magnetic conductor places the closed magnet circuit in this at least one magnetic field, and this magnetic circuit component produces the forward coupling power of at least one direction relatively; When this magnetic conductor and this magnetic circuit component have magnetic resistance change rate because of the relative motion of this at least one direction, can produce the magnet spring power of at least one direction.

Wherein this magnetic circuit component can be fixture and this circuit block is a moving member, and perhaps, this magnetic circuit component can be moving member and this circuit block is a fixture.

Wherein this magnetic circuit component more can comprise at least one magnetic conductor, makes this magnetic field of its generation, can be in this magnetic circuit component towards this circuit block and form the pole surface of at least two opposed polarities adjacent to the surface of this air gap.

For reinforcement prevents laterally offset of voice coil motor moving part and lift-over, this magnetic circuit component and this circuit block can be done following variation:

Wherein this magnetic circuit component more can be provided with at least one groove along the direction of this relative motion in the surface towards this circuit block.

Wherein this magnetic conductor of this circuit block more can be provided with at least one groove or shrinkage pool in the surface towards this magnetic circuit component.

Be magnet spring force constant and the no current balance point of adjusting this voice coil motor, this magnetic conductor of this circuit block can be done following variation:

Wherein this magnetic conductor of this circuit block more can be provided with the different face of at least one slope in first side and second side of the direction of parallel this relative motion, perhaps can be provided with at least one cascaded surface.

Wherein this magnetic conductor of this circuit block maybe can be provided with the different face of at least one slope in being provided with at least one cascaded surface towards this magnetic circuit component.

For forcing limitation voice coil motor moving part is the rotation of axle with this direction of relative movement, this voice coil motor must produce one perpendicular to the forward suction of this direction of relative movement or repulsion so that a side direction precompression to be provided, the circuit block of this voice coil motor can be done following variation:

This magnetic conductor of this circuit block wherein can have the extension that coats the non-side towards this circuit block of this magnetic circuit component, perhaps the center line of this magnetic conductor more relatively the center line of this magnetic circuit component setover.

Wherein this circuit block more can comprise magnetic conductor or the magnetite in this magnetic field of being located at non-and the direct commissure of this coil.

For making this magnetic circuit component and this circuit block keep this air gap, and make this magnetic circuit component and this circuit block can keep a parallel relative motion, this voice coil motor more can comprise a suspention support component.

For the application than short stroke, this suspention support component comprises a plurality of traction things, and at least two these traction things be isometric and configured in parallel to constitute a parallel limiting structure.

Wherein each this traction thing material that is flexible deformation constitutes or is one to have the linking arm of first joint and second joint.

Application for long stroke, this suspention support component can comprise by contact-making surface groove and the protruding thing of contact-making surface, and wherein between a set of contact face groove and the protruding thing of contact-making surface for 2 or at least two lines or at least the two sides contact, between another set of contact face groove and the protruding thing of contact-making surface for more at least at least one line or at least one side contact.

In like manner this suspention support component can comprise a plurality of contact-making surface grooves and a plurality of rolling element, at least two rolling elements of clamping between a set of contact face groove wherein, and each this rolling element of contact-making surface groove and each contacts for 2 or two lines at least, also at least two rolling elements of clamping between another set of contact face groove, and each this rolling element of contact-making surface groove and each for more at least or at least one line contact.

Application for swing offset, this suspention support component comprises the contact-making surface groove of annulus guiding, the protruding thing of contact-making surface of annulus guiding, wherein between the contact-making surface groove of this annulus guiding and the protruding thing of contact-making surface that this annulus guides at least two lines or at least the two sides contact.

In like manner this suspention support component also can comprise the contact-making surface groove of first annulus guiding, contact-making surface groove and a plurality of rolling element of second annulus guiding, the a plurality of rolling elements of clamping between the contact-making surface groove of this first annulus guiding and the contact-making surface groove of this second annulus guiding, and this rolling element of contact-making surface groove and each of guiding of each annulus contacts for 2 or two lines at least.

A kind of method that makes voice coil motor have magnet spring power must comprise following two steps:

A) in this voice coil motor, a magnetic conductor is set in the magnetic field that a magnetic circuit component that comprises at least one magnetite is given birth to; And

B) make this magnetic conductor and this magnetic circuit component that one balance point of minimum reluctance generation be arranged along the direction of displacement of this voice coil motor, and when it had displacement with respect to this balance point, this magnetic field also increased progressively with the displacement increase through the equivalent magnetic resistance of this magnetic conductor institute closed magnet circuit.

This method more can comprise and places this magnetic field to strengthen the step of damping one conductive metal sheet.

A kind of method of using magnet spring power to reach displacement control comprises following steps:

A) take a motor apparatus with magnet spring power;

B) displacement command is converted to an equivalent current order according to the producible displacement of the unitary current of this motor apparatus; And

C) should the equivalence current order power amplifier that electrically connects of the coil of input one and this motor apparatus, make the propulsive force that coil current produced of this motor apparatus be equilibrated at this displacement command the magnet spring power of corresponding displacement.

For reaching the absolute position control of closed-loop path, this displacement control method more can may further comprise the steps:

A) use a position transducer to measure the real time position of this motor apparatus moving part, obtain an equivalent real time position;

B) difference of this displacement command and this equivalence real time position is imposed one and comprise that at least the control computing of an integration step obtains an alternate position spike offset current order; And

C) this alternate position spike offset current order is added this equivalence current order.

For reaching the enhancing damping characteristic, this displacement control method more can may further comprise the steps:

A) measure the back electromotive force at the coil two ends of this motor apparatus, with the equivalent displacement speed of the moving part of obtaining this motor apparatus;

B) speed command or that is equivalent to zero velocity is subtracted each other by the speed command of this displacement command differential gained and this equivalence velocity of displacement obtain an equivalent velocity error, and should the equivalence velocity error amplify and obtain one and strengthen the damping current order with a ride gain value; And

C) should strengthen the damping current order and add this equivalence current order.

Compared with prior art, the present invention has the following advantages:

The invention provides a kind of voice coil motor and use magnet spring power to reach the method for displacement control, solved and kept homogeneous elastic force constant on the elastomeric material volume production of elastomer voice coil motor and deformation behavior is reached the problem of aclinal motion, also strengthen the anti-reliability of falling of this voice coil motor, simultaneously can exempt the interpolation of damping glue again and reach the characteristic of high damping; A kind of high-reliability voice coil motor of nonelastic body, its decapacitation are guaranteed aclinic high reappearance displacement, also can reach the displacement controlled function of open circuit high damping.

Description of drawings

Figure 1A: according to the schematic diagram of the voice coil motor magnetic structure of first kind of surperficial magnetite type structure of the invention process;

Figure 1B: the schematic diagram that is subjected to displacement magnetic resistance change rate according to the voice coil motor magnetic structure of first kind of surperficial magnet structure of the invention process;

Fig. 2: according to the schematic diagram of the voice coil motor magnetic structure of second kind of concentrated flux type of the invention process;

Fig. 3: according to the schematic diagram of the voice coil motor magnetic structure of the third no yoke type of the invention process;

Fig. 4 A: according to the schematic diagram of the cylindrical shape voice coil motor magnetic structure of the 4th kind of mixed type of the invention process;

Fig. 4 B: according to the magnetic structure schematic diagram that in the 4th kind of mixed type cylindrical shape voice coil motor of the invention process the cylinder magnetite is inserted the cylinder magnetic conductor;

Fig. 4 C: the magnetic structure schematic diagram that annular magnetizer is replaced the cylinder magnetic conductor according to the cylindrical shape voice coil motor of the 4th kind of mixed type of the invention process;

Fig. 5 A: according to the schematic diagram of voice coil motor inclination circuit block of the invention process with adjustment magnet spring force constant and no current balance point;

Fig. 5 B: according to the yoke of voice coil motor biasing circuit parts of the invention process to adjust the schematic diagram of magnet spring force constant and no current balance point;

Fig. 6 A: in the parallel motion direction and perpendicular to the two ends of two facades on magnetic circuit component surface, be provided with symmetrical oblique angle to adjust magnet spring force constant and no current balance point schematic diagram according to the yoke of the circuit block of voice coil motor of the invention process;

Fig. 6 B: in the parallel motion direction and perpendicular to the two facade two ends on magnetic circuit component surface, be provided with asymmetric oblique angle to adjust magnet spring force constant and no current balance point schematic diagram according to the yoke of the circuit block of voice coil motor of the invention process;

Fig. 6 C: in the parallel motion direction and perpendicular to the two ends of two facades on magnetic circuit component surface, be provided with cascaded surface to adjust the schematic diagram of no current balance point according to the yoke of the circuit block of voice coil motor of the invention process;

Fig. 7 A: in towards air gap, be provided with a groove or shrinkage pool to adjust magnet spring force constant and no current balance point schematic diagram according to the yoke of the circuit block of voice coil motor of the invention process;

Fig. 7 B: according to the yoke of the circuit block of voice coil motor of the invention process in towards air gap and there is not the coil coverage rate, be provided with a groove or shrinkage pool, its center line does not coincide with the center line configuration of this yoke along the direction of motion, to adjust magnet spring force constant and no current balance point schematic diagram;

Fig. 8 A: in towards air gap and there is not the coil coverage rate, be provided with a projection ladder plane, to adjust magnet spring force constant and no current balance point schematic diagram according to the yoke of the circuit block of voice coil motor of the invention process;

Fig. 8 B: in towards air gap and there is not the coil coverage rate, have additional a plurality of projection ladders plane, to adjust magnet spring force constant and no current balance point schematic diagram according to the yoke of the circuit block of voice coil motor of the invention process;

Fig. 8 C: in towards air gap and there is not the coil coverage rate, have additional a plurality of inclined-planes, to adjust magnet spring force constant and no current balance point schematic diagram according to the yoke of the circuit block of voice coil motor of the invention process;

Fig. 9: according to the suspention support component of voice coil motor of the invention process, and schematic diagram that linking arm be rotatably connected joint configured in parallel form isometric by three;

Figure 10: according to the suspention support component of voice coil motor of the invention process, and wire configured in parallel isometric by three drawn the schematic diagram that thing is formed;

Figure 11 A: the schematic diagram when relative swing offset taking place according to the voice coil motor magnetic structure of first kind of surperficial magnet structure of the invention process;

Figure 11 B: overlap the area change schematic diagram when relative swing offset taking place according to the voice coil motor magnetic structure of first kind of surperficial magnet structure of the invention process;

Figure 12 A: according to the voice coil motor magnetic structure of first kind of surperficial magnet structure of the invention process, the magnetite of its magnetic circuit component and the yoke of circuit block respectively have the groove along direction of displacement, and the schematic diagram when relative swing offset takes place;

Figure 12 B: according to the voice coil motor magnetic structure of first kind of surperficial magnet structure of the invention process, the magnetite of its magnetic circuit component and the yoke of circuit block have the groove along direction of displacement, and overlap the schematic diagram of area change when relative swing offset takes place;

Figure 13:, be the schematic diagram of an angle configurations each other by two groups of parallel limiting structures according to the suspention support component of voice coil motor of the invention process;

Figure 14: when being interfered power, cause one to be the schematic diagram of the relative swing offset of axle with the direction of displacement according to the suspention support component of voice coil motor of the invention process;

Figure 15: according to voice coil motor of the invention process, its circuit block has the extension that coats towards a side of magnetic circuit component, to produce a schematic diagram perpendicular to the forward suction of direction of displacement;

Figure 16: according to voice coil motor of the invention process, its circuit block comprises a magnetic conductor of being located at the non-side towards circuit block of this magnetic circuit component, to produce a schematic diagram perpendicular to the forward suction of direction of displacement;

Figure 17: according to voice coil motor of the invention process, its circuit block comprises a magnetite of being located at the non-side towards circuit block of this magnetic circuit component, to produce a schematic diagram perpendicular to the forward suction of direction of displacement;

Figure 18: according to voice coil motor of the invention process, its circuit block comprises a magnetite of being located at the non-side towards circuit block of this magnetic circuit component, to produce a schematic diagram perpendicular to the forward repulsion of direction of displacement;

Figure 19: according to voice coil motor of the invention process, the magnetic conductor of its circuit block is setovered with respect to coil neutralization, to produce the schematic diagram of a side-to-side alignment power;

Figure 20: according to the suspention support component of voice coil motor of the invention process, the schematic diagram of forming by the sliding contact guide structure;

Figure 21: according to the suspention support component of voice coil motor of the invention process, the schematic diagram of forming by rolling contact guidance structure;

Figure 22: when rotatablely moving, it suspends support component in midair according to voice coil motor of the invention process, the schematic diagram of being made up of ring-like sliding contact guide structure;

Figure 23: when rotatablely moving, it suspends support component in midair according to voice coil motor of the invention process, the schematic diagram of being made up of ring-like rolling contact guidance structure;

Figure 24: according to the explanation calcspar of displacement control method of the invention process;

Figure 25: the most preferred embodiment structure chart that has two direction degree of freedom displacements according to the voice coil motor of use open circuit displacement control of the invention process;

Figure 26: the most preferred embodiment structure chart that has outside plate circuit block according to the voice coil motor of use open circuit displacement control of the invention process;

Figure 27: the most preferred embodiment structure chart that has inner circular cartridge type circuit block according to the voice coil motor of use open circuit displacement control of the invention process;

Figure 28: the most preferred embodiment structure chart that has the rolling guide structure according to the voice coil motor of use of the invention process closed-loop path Position Control;

Figure 29: existing voice coil motor adopts the structural representation of linear slide rail;

Figure 30: existing shell fragment type voice coil motor adopts elastomeric material suspention and the magnetic balanced principle schematic of coil current.

The primary clustering symbol description is as follows:

11 magnetic circuit component

111 yokes

112 first magnetites

113 second magnetites

12 circuit blocks

121 coils

122 magnetic conductors

123 conductive metal sheets

13 air gaps

14 magnetic fields

Path, 15 magnetic field

16 directions of arrow

21 magnetic circuit component

211 first yokes

212 second yokes

213 magnetites

214 directions of arrow

22 circuit blocks

221 coils

222 magnetic conductors

23 air gaps

24 magnetic fields

31 magnetic circuit component

The 311 extremely incorgruous magnetites that magnetize

32 circuit blocks

321 coils

322 magnetic conductors

33 camber lines

34 air gaps

35 magnetic fields

41 magnetic circuit component

411 L type yokes

412 annular magnetites

413 directions of arrow

414 annular yokes

42 circuit blocks

421 coils

422 cylinder magnetic conductors

423 rigid bodies

424 cylinder magnetites

425 annular magnetizers

431,432 first air gaps, interstice

441,442 first magnetic fields, second magnetic field

51 magnetic circuit component

511 magnetic circuit component center lines

52 circuit blocks

521 coils

522 magnetic conductors

523 magnetic conductor center lines

524 coil neutralizations

53 air gaps

61 magnetic circuit component

62 magnetic conductors

621,622 (symmetry) oblique angle

623,624 asymmetric oblique angles

625,626 cascaded surfaces

63 direction of displacement

64 slope variation intersection points

71 magnetic conductors

711 coils

712 magnetic conductor center lines

72 air gaps

73 grooves or shrinkage pool

731 center lines

74 direction of displacement

75 magnetic circuit component

801 magnetic conductors

802 magnetic circuit component

803 coils

804 projection ladder planes

805,806 projection ladder planes

807,808 inclined-planes

901 linking arms

902 magnetic circuit component

9021 rotating shafts

903 pedestals

9031 rotating shafts

904 circuit blocks

905 air gaps

1001 wire traction thing

1002 magnetic circuit component

1003 pedestals

10031 columns

10032 columns

1004 circuit blocks

1005 air gaps

1101 magnetic circuit component

1102 circuit blocks

1103 directions of arrow

1104 arrows

1105 align the involution magnetic torque

1201 magnetic circuit component

12011 magnetites

1202 circuit blocks

12021 magnetic conductors

1203 grooves

1204 grooves

1205 arrows

1206 directions of arrow

1207 directions of motion

13,011 first groups of parallel limiting structures

13,012 second groups of parallel limiting structures

1302 magnetic circuit component

1303 pedestals

13031,13032 columns

1304 circuit blocks

1305 air gaps

1306 inclination directions

1401 arrows

1402 magnetic circuit component

1403 directions of arrow

1501 circuit blocks

15011 coils

15012 magnetic conductors

1502 magnetic circuit component

1503 air gaps

1504 extensions

1505 direction of displacement

1506 forward suction

1507 wire traction thing

1508 columns

1601 circuit blocks

1602 magnetic circuit component

1603 magnetic conductors

1604 direction of displacement

1605 forward suction

1606 wire traction thing

1607 columns

1701 circuit blocks

1702 magnetic circuit component

1703 magnetites

1704 direction of displacement

1705 forward suction

1706 wire traction thing

1707 columns

1801 circuit blocks

1802 magnetic circuit component

1803 magnetites

1804 direction of displacement

1805 forward repulsion

1806 wire traction thing

1807 columns

1901 circuit blocks

19011 magnetic conductors

19012 coils

19013 center lines

1902 magnetic circuit component

19021 center lines

1903 direction of displacement

1904 side-to-side alignment power

1905 wire traction thing

1906 columns

2001 moving members

20,011 first contact-making surface grooves

20,012 second contact-making surface grooves

2002 fixtures

The protruding thing of 20,021 first contact-making surfaces

The protruding thing of 20,022 second contact-making surfaces

2003 forward coupling power

20,041 first reaction forces

20,042 second reaction forces

20043 reaction forces

2101 moving members

21,011 first contact-making surface grooves

21,012 second contact-making surface grooves

2102 fixtures

21,021 first contact-making surface grooves

21,022 second contact-making surface grooves

2103,2104 rolling elements

2105 forward coupling power

2201 contact-making surface grooves

The protruding thing of 2202 contact-making surfaces

2203 circuit blocks

2,204 first rigid bodies

2205 magnetic circuit component

2,206 second rigid bodies

2207 forward coupling power

2301 contact-making surface grooves

2302 contact-making surface grooves

2303 rolling elements

2304 circuit blocks

2,305 first rigid bodies

2306 magnetic circuit component

2,307 second rigid bodies

2308 forward coupling power

2401 equivalent currents produce square

2402 back electromotive force conversion speed squares

2403 differential squares

2404 subtractions gain square

2405 synthetic squares

2406 power amplifiers

2407 coils

2408 position transducers

2409 subtraction squares

2410 control computing squares

2501 bases

25011 walls

2502 plate circuit blocks

25,021 first coils

25022 dull and stereotyped yokes

25,023 second coils

2503 move seat

25,031 first parallel limiting structures

25,032 second parallel limiting structures

25041 arc yokes

25,042 first magnetites

25,043 second magnetites

25044 the 3rd magnetites

25045 the 4th magnetites

2,505 first directions of arrow

2,506 second directions of arrow

2601 bases

2602 walls

2603 move seat

2604 plate circuit blocks

26041 coils

26042 yokes

26,051 first parallel limiting structures

26,052 second parallel limiting structures

2,606 first magnetic circuit component

2,607 second magnetic circuit component

2701 bases

2,702 first walls

2,703 second walls

2704 cylindrical shape circuit blocks

27041 coils

27042 arc yokes

2705 move seat

27,061 first magnetic circuit component

27,062 second magnetic circuit component

27063 the 3rd magnetic circuit component

27064 columns

27,071 first parallel limiting structures

27,072 second parallel limiting structures

2708 directions of arrow

2709 wire traction thing

2801 bases

2,802 first columns

28,021 first contact-making surface grooves

2,803 second columns

28,031 second contact-making surface grooves

2804 circuit blocks

28041 coils

28042 yokes

2805 move seat

28051 the 3rd contact-making surface grooves

28052 the 4th contact-making surface grooves

2806 magnetic circuit component

2,807 first groups of a plurality of balls

2,808 second groups of a plurality of balls

2809 position transducers

2810 positioners

29011, yoke, lower yoke on 29012

29013,29014 magnet

2903 coils

2904 air gaps

29051 slide section

29052 slide rail portions

29053 rolling steel balls

3001 coils

3002 magnetites

3003 yokes

The brace of 3004 branches

Embodiment

Existing voice coil motor, by above stated specification as can be known, its moving member is made of simple coil, so between moving member and fixture except that along the propulsive force of direction of displacement, there is no other coupling power; Voice coil motor of the present invention, the embodiment of its basic principle shown in Figure 1A, one magnetic circuit component 11 has a yoke 111, its inner face posts opposite polarity first magnetite 112 and second magnetite 113, certainly, this two magnetite can be made of the magnetite that a surface has an opposed polarity, one circuit block 12 is except a coil 121, also has a magnetic conductor 122, both are rigidly connected and are one, 12 of this magnetic circuit component 11 and this circuit blocks have an air gap 13, set out by first magnetite 112 in one magnetic field 14, pass through this coil 121 by this air gap 13, arrive this magnetic conductor 122, magnetic conduction by this magnetic conductor 122, wear back this coil 121 again, arrive second magnetite 113 through this air gap 13, get back to first magnetite 112 to constitute closed magnet circuit by yoke on this 111 again, when above-mentioned magnetic circuit component and this circuit block when a direction of arrow 16 has relative displacement, shown in Figure 1B, this magnetic field becomes long path 15, thereby increase magnetic resistance, yet, magnetic circuit system has the trend of trend minimum reluctance, therefore, when the state of Figure 1B appears in voice coil motor, must there be an involution power to make its state of replying Figure 1A, certainly, this involution power increases with the increase of displacement, basically, this involution power is one with the displacement linear change and have the power of a stable equilibrium point, and using two magnetite repulsive interactions compared to existing technology is one to be inverse square and not have the power of stable equilibrium point with distance, more be similar to a magnet spring power, therefore, can define a magnet spring force constant is the magnet spring power that unit displacement produced, so, with regard to effect, this magnet spring power can be used for replacing the elastic force that elastomer produces; Certainly, change, when the length of this magnetic circuit component is very long relatively as magnetic conductor, magnet spring power is disappeared when this magnetic conductor is designed to not have magnetic resistance.

In this coil 121, there is electric current to pass through, this electric current and this magnetic field 14 reciprocations, can produce a propulsive force, be so-called Lao Lunsili, therefore, this magnetic circuit component 11 and this circuit block 12 be propulsive force and begin to quicken therefore, produce relative displacement, but, when magnet spring power that this displacement produced equaled this thrust, this magnetic circuit component and this circuit block can stop to quicken, and have certain damping as this voice coil motor, instantaneous energy in this accelerator is consumed, and can utilize this coil current of control to reach does not need position feedback transducer and elastomeric displacement control.

For above-mentioned instantaneous energy is consumed, voice coil motor of the present invention, this magnetic conductor 122 of this circuit block 12, be generally a yoke, it is essentially an electric conductor, therefore because of the displacement process magnetic resistance change rate takes place when this magnetic field 14 of this magnetic circuit component 11, when being taken place, the commissure magnetic flux of this magnetic conductor 122 becomes, according to Lenz's law, can produce the vortex flow that an opposing becomes magnetic flux this moment in this magnetic conductor 122, this vortex flow can produce one ohm of damage, so the instantaneous energy in the displacement process becomes ohm and decrease and consume, for strengthening the consumption of this ohm damage, more can be in this magnetic field 14 of this magnetic circuit component 11 at this circuit block 12, in conjunction with a conductive metal sheet 123, as: copper, aluminium, good conductive material such as silver, at this moment, because of magnetic resistance change given birth to the time become magnetic flux vortex flow will significantly increase, it caused, and ohm decreases then is and square doubly increases, thereby strengthens damping characteristic, so can not need add damping glue and reach the placement property of certain damping.

Above-mentioned these magnetic field 14 commissures this magnetic circuit component 11 and this circuit block 12, because this magnetic circuit component 11 keeps an air gap 13 to be provided with this circuit block 12, therefore, both are being an attraction towards having a forward coupling power of giving birth to because of the magnetic loop commissure between the air gap.

After the basic operation principles of understanding voice coil motor of the present invention, below will do an elaboration at the same magnetic structure that can reach magnet spring power.The present invention proposes four kinds of possible implementation at this, so that can clearer and more definite understanding be arranged to magnetic structure of the present invention.

First kind of magnetic structure is the above-mentioned surperficial magnetite type structure that is used for principle of specification.

Second kind of magnetic structure is for concentrating the flux type, embodiment as shown in Figure 2, one magnetic circuit component 21 has the opposite polarity two sides that first yoke 211 and second yoke 212 are affixed on a magnetite 213 that magnetizes along the direction of arrow 214 respectively, one circuit block 22 is except a coil 221, also has a magnetic conductor 222, both are rigidly connected and are one, 22 of this magnetic circuit component 21 and this circuit blocks have an air gap 23, on the principle, promptly utilize the magnetic circuit component of this figure to replace the magnetic circuit component of Figure 1A, this magnetic structure in like manner in Figure 1A to constitute closed magnet circuit.

The third magnetic structure is no yoke type, as shown in Figure 3, one magnetic circuit component 31 only has an extremely incorgruous magnetite that magnetizes 311, be used for replacing the magnetic circuit component of Figure 1A and Fig. 2, one circuit block 32 is except a coil 321, also has a magnetic conductor 322, both are rigidly connected and are one, 32 of this magnetic circuit component 31 and this circuit blocks have an air gap 34, the characteristic of this extremely incorgruous magnetite that magnetizes 311 is for directly forming the different magnetic pole of polarity in the surface towards this circuit block 32, but the magnetic line of force between the different magnetic pole of this bipolarity, need not pass through extra yoke magnetic conduction, its magnetic line of force passes through the camber line 33 between magnetite two opposed polarity magnetic poles own, and the magnetic field 35 of this magnetic structure in like manner constitutes closed magnet circuit in Figure 1A.

The 4th kind of magnetic structure is mixed type, as shown in Figure 4, this is a cylindrical shape voice coil motor embodiment, it is that the cylinder yoke 411 and of L type has an annular magnetite 412 and an annular yoke 414 that magnetizes along the direction of arrow 413 that one magnetic circuit component 41 has a cross section, one circuit block 42 is except a coil 421, also has a cylinder magnetic conductor 422, both utilize a rigid body 423 to connect as one, 42 of this magnetic circuit component 41 and this circuit blocks have first air gap 431 and interstice 432, set out by this L type yoke 411 in first magnetic field 441 of this magnetic structure, pass through this coil 421 by first air gap 431, arrive this annular yoke 414, by this magnetite 412, get back to this L type yoke 411 to constitute closed magnet circuit; Set out by this annular yoke 414 in second magnetic field 442 of this magnetic structure, pass through this interstice 432,, pass through this interstice 432 again and arrive this L type yoke 411 by this magnetic conductor 422, by this magnetite 412, get back to this annular yoke 414 again to constitute closed magnet circuit; The characteristic of this magnetic circuit is that this coil is with respect to the magnetic structure of magnetic circuit component for existing voice coil motor, the relative magnetic circuit component of this magnetic conductor is only the mechanism that produces forward coupling power and magnet spring power, certain above-mentioned voice coil motor magnetic structure, more can be shown in Fig. 4 B, with this cylinder magnetic conductor central authorities insert one with the opposite polarity cylinder magnetite 424 of annular magnetite to strengthen second magnetic field intensity, certainly more can be shown in Fig. 4 C, this cylinder magnetic conductor is replaced with an annular magnetizer 425, and combine with this coil, directly insert in the magnetic loop in first magnetic field.

Above-mentioned four kinds of magnetic structure embodiment that only present technique proposed for convenience of description, be familiar with the personnel of correlation technique of the present invention, can use above-mentioned idea to be combined into different magnetic structures, as implement illustration 25 to Figure 27, a plurality of magnetic circuit component are placed four jiaos an of circumference, to improve space availability ratio, this circuit block can place the outerplanar or the inner headed face of this magnetic circuit component, perhaps in this circuit block of above-mentioned four kinds of magnetic structures, add magnetite again to strengthen this magnetic field intensity as Fig. 4 B, in any case distortion, voice coil motor magnetic structure of the present invention all must possess following characteristics, promptly this magnetic circuit component comprises at least one magnetite and produces at least one magnetic field, this magnetic field can be by magnetite itself or at least one magnetic conductor magnetic conduction that additionally comprises, make it can be in this magnetic circuit component towards this circuit block and form the pole surface of at least two opposed polarities adjacent to the surface of this air gap, and this circuit block comprises at least one coil and at least one magnetic conductor, and keep at least one air gap setting with this magnetic circuit component, this at least one coil places this magnetic field and passes to an electric current and produces a propulsive force with this at least one magnetic field reciprocation, make this magnetic circuit component and this circuit block can reach a relative motion, the closed magnet circuit that this magnetic conductor places this at least one magnetic field this magnetic circuit component relatively produces at least one forward coupling power, when this magnetic conductor and this magnetic circuit component have magnetic resistance change rate because of this relative motion, can produce a magnet spring power, utilize this propulsive force and this magnet spring dynamic balance can reach displacement control.

Voice coil motor explained above, no matter which kind of magnetic structure, wherein this magnetic circuit component and this circuit block have much the same quality, therefore, this magnetic circuit component can be fixture and this circuit block is a moving member, and perhaps, this magnetic circuit component can be moving member and this circuit block is a fixture, certainly, the life problems that can avoid frequent mobile service cable to cause for fixing circuit block.

In sum, voice coil motor of the present invention, the magnetic conductor that its circuit block comprised, when relative displacement being arranged and magnetic resistance change rate takes place with its magnetic circuit component, can produce a magnet spring power, therefore, when can be on magnetic Circuit Design, change minimum reluctance origination point and magnetic resistance and can effectively adjust no current balance point and magnet spring force constant with the rate of change of displacement, below will be at being applicable to aforementioned several magnetic structure, how to change this magnetic conductor in the above-mentioned voice coil motor circuit block and reach above-mentioned functions, be elaborated with several feasible embodiment.

Shown in Fig. 5 A, with circuit block 52 with respect to a magnetic circuit component 51 tilted configuration, then magnetic circuit component 51 can move toward air gap 53 little directions when coil is not excitatory, promptly the direction toward the magnetic resistance minimum moves, therefore can change the no current balance point, and when the slope difference of its inclination, the change rate of magnetic reluctance that its unit displacement produced is also different, therefore can reach the effect of adjusting the magnet spring force constant.

Shown in Fig. 5 B, the center line 523 of this magnetic conductor 522 can not coincide with center line 524 configurations of this coil 521.At this moment, the center line 511 of this magnetic circuit component 51 has these magnetic conductor 522 center lines 523 of alignment, reaches the trend of minimum reluctance, therefore can change the no current balance point.

As shown in Figure 6A, this magnetic conductor 62 is in translation direction 63 and perpendicular to the two ends of the two sides on magnetic circuit component 61 surfaces, can be provided with symmetrical oblique angle 621,622, when this two oblique angle 621,622 slope changes can adjust the magnet spring force constant, when the big more then magnet spring of slope force constant also big more, certainly, shown in Fig. 6 B, the symmetrical oblique angle 621 at these two ends, 622 can asymmetric oblique angle 623 along direction of displacement 63,624 replace, at this moment, the center line of magnetic circuit component 61 can make the magnetic conductive area maximum towards these slope variation intersection point 64 skews, reach the trend of minimum reluctance, therefore can change the no current balance point; Shown in Fig. 6 C, this oblique angle 621,622 can replace by cascaded surface 625,626, and it can equivalence adjust no current balance point and magnet spring force constant.

Shown in Fig. 7 A, this magnetic conductor 71 is in the face towards air gap 72, can be provided with at least one groove or shrinkage pool 73, when changing along the width of direction of displacement 74, this groove or shrinkage pool 73 can adjust the magnet spring force constant, in like manner, shown in Fig. 7 B, when the center line 731 of groove or shrinkage pool 73 does not coincide with center line 712 configurations of this magnetic conductor 71 along direction of displacement 74, at this moment, the center line of magnetic circuit component 75 can fall between the center line 712 of the center line 731 of this groove or shrinkage pool 73 and this magnetic conductor 71, reach the trend of minimum reluctance, therefore can change the no current balance point.

Shown in Fig. 8 A, this magnetic conductor 801 is towards this magnetic circuit component 802 and the surface adjacent with this coil 803, can be provided with a projection ladder plane 804, when the width change on this projection ladder plane 804 can be adjusted the magnet spring force constant, in like manner, do not coincide with the center line configuration of this magnetic conductor 801 when projection ladder plane 804 center lines, at this moment, the center line of magnetic circuit component 802 can fall between these projection ladder plane 804 center lines and this magnetic conductor 801 center lines, reach the trend of minimum reluctance, therefore can change the no current balance point.Shown in Fig. 8 B, also can add a plurality of projection ladders plane 805,806, the size of utilizing this two air gap that platform causes to be to adjust the magnet spring force constant, utilize this air gap about do not wait and can change the no current balance point.Same principle, shown in Fig. 8 C, this magnetic conductor 801 is towards this magnetic circuit component 802 and the surface adjacent with this coil 803, can be provided with two inclined-planes 807,808, because this two inclined-plane will cause magnetic resistance because of the different graded of unit displacement occurrence degree, therefore can adjust this magnet spring force constant, and utilize the slope difference on inclined-plane, two ends 807,808, then can adjust the no current balance point.

In sum, the magnetic circuit component of voice coil motor of the present invention and circuit block, the face of its adjacent air gap has a forward coupling power, for resisting this forward coupling power, this air gap is kept, voice coil motor of the present invention more can comprise a suspention support component, certainly, this suspention support component removes and is used for resisting above-mentioned forward coupling power, make and keep an air gap between magnetic circuit component and circuit block, in addition, but this forward coupling power just this suspention support component of precompressed and reach high reproducible placement property eliminating the play of this suspention support component, this is to using voice coil motor when the optics imaging system, especially important, below will be elaborated with several feasible embodiment at the suspention support component that can reach above-mentioned functions.

Application scenario when voice coil motor of the present invention, when its required displacement stroke is very little, as the automatic Focusing module of microminiaturization, its displacement is less than 0.5mm, fundamental method can adopt the principle of parallel rod, one suspention support component, as shown in Figure 9, for the linking arm 901 that has shackle-joint by three is formed, wherein at least two linking arms 901 are isometric and be arranged in parallel to constitute a parallel limiting structure, in this example, the circuit block 904 of this voice coil motor is for fixture and comprise a pedestal 903, this pedestal 903 is provided with a plurality of rotating shafts 9031, the magnetic circuit component 902 of this voice coil motor is a moving member, which is provided with a plurality of rotating shafts 9021, each this linking arm 901, one end is rotationally connected with the rotating shaft 9021 of voice coil motor magnetic circuit component 902, the other end is rotationally connected with the rotating shaft 9031 of pedestal 903, wherein the internal diameter of this shackle-joint is slightly larger than the external diameter of this rotating shaft 9021, because this circuit block 904 and 902 of this magnetic circuit component have forward suction, therefore the joint rotary gap of shackle-joint can be eliminated and kept the rolling contact of a line, but make 904 of magnetic circuit component 902 and circuit blocks keep an air gap 905, because wherein two linking arms 901 are isometric and configured in parallel, and its joint is to be equivalent to freely rolling of low friction, therefore, this magnetic circuit component 902 must be followed the motor pattern of parallel rod, make with respect to this circuit block 904 and do high reproducible parallel relative displacement, certainly, shackle-joint is a suspention feature of the present invention for convenience of description, this shackle-joint can be by ball-and-socket joint, formations such as arcuation joint, no matter which kind of joint, its feature only need freely to relatively rotate and are connected in this magnetic circuit component or this circuit block gets final product.

The suspention support component of above-mentioned application parallel rod structure, when being applied to microminiaturized voice coil motor, its volume is still bigger than normal a little, following embodiment will draw thing with wire and replace above-mentioned linking arm, one suspention support component, as shown in figure 10, for forming by three wire traction things 1001, wherein at least two wire traction things 1001 are isometric and be arranged in parallel to constitute a parallel limiting structure, in this example, the circuit block 1004 of this voice coil motor is for fixture and comprise a pedestal 1003, this pedestal 1003 is provided with two columns 10031,10032, the magnetic circuit component 1002 of this voice coil motor is a moving member, each these wire traction thing 1,001 one end is fixedly connected on voice coil motor magnetic circuit component 1002, the other end is fixedly connected on two columns 10031 of a pedestal 1003,10032, because but the soft materials that these three wire traction things are free bend deformation constitutes, therefore must be by the forward suction of 1002 of this circuit block 1004 and this magnetic circuit component, make these three wire traction things, 1001 supports straight, but make 1004 of magnetic circuit component 1002 and circuit blocks keep an air gap 1005, because wherein at least two wire traction things 1001 are isometric and be arranged in parallel, therefore, this magnetic circuit component 1002 must be followed the motor pattern of parallel rod, makes with respect to this circuit block 1004 and does not have friction and parallel relative displacement.

But, it should be noted that, when the suspention support component that uses above-mentioned three wire traction thing, shown in Figure 11 A, its magnetic circuit component 1101 and circuit block 1102 may have the instantaneous relative swing offset of the direction of arrow 1103, the suspention support component of therefore planting structure also can't limit the degree of freedom of this swing offset direction, and this swing offset can make parallel motion produce side direction lift-over inclination angle, this is to using voice coil motor when the optics imaging system, produce negative effect, therefore, be necessary to illustrate and how suppress this instantaneous relative swing offset, observe from the direction of arrow 1104, shown in Figure 11 B, its magnetic circuit component 1101 and circuit block 1102, as relative swing offset, the coincidence area of both adjacent air gaps diminishes, promptly deduct the oblique line area, thereby magnetic resistance is increased, therefore produce a pair of positive involution magnetic torque 1105, make above-mentioned magnetic circuit component 1101 return back to the complete coincidence status that aligns with circuit block 1102, the moment that this kind aligns automatically illustrates also why this relative swing offset is instantaneous reason.In order effectively to suppress this instantaneous relative swing offset, then must strengthen this and align the involution magnetic torque, is embodiment at this with surperficial magnetite type magnetic structure, shown in Figure 12 A, can be provided with at least one groove 1203 in two pole surface respectively at this magnetite 12011 of this magnetic circuit component 1201 along parallel direction of relative movement towards circuit block 1202, perhaps this magnetic conductor 12021 of this circuit block 1202 also can be provided with at least one groove 1204 along parallel direction of relative movement 1207 in the surface towards magnetic circuit component 1201, certainly, this groove can replace with shrinkage pool, thus, observe from the direction of arrow 1205, when above-mentioned magnetic circuit component 1201 has relative swing offset with circuit block 1202 with the direction of arrow 1206, shown in Figure 12 B, its non-coincidence area will become the twice of Figure 11 B, thereby magnetic resistance also increases to twice, and this aligns the involution magnetic torque and also increases to twice certainly, therefore this instantaneous side direction lift-over inclination angle that relative swing offset produced of also more effective inhibition.

The side direction lift-over inclination angle that relative swing offset produced that above-mentioned inhibition is instantaneous, be to be example with surperficial magnetite type, certainly, this design spirit can very directly be applied to other magnetic structure, yet do not break away from following feature, this magnetic circuit component can be provided with at least one groove along direction of relative movement in the pole surface towards circuit block; This magnetic conductor of this circuit block more can be provided with at least one groove or shrinkage pool along this direction of relative movement in the surface towards this magnetic circuit component.

For side direction lift-over inclination angle does not take place in suspention support component fully that make three wire tractions of above-mentioned use thing, be necessary to improve at this suspention support component, the simplest method is, embodiment as shown in figure 13, one suspention support component comprises that being an angle configurations each other by first group of parallel limiting structure 13011 and second group of parallel limiting structure 13012 is constituted, each is organized parallel limiting structure and the wire that be arranged traction thing isometric by at least two and forms, wherein each wire traction thing one end is fixedly connected on voice coil motor magnetic circuit component 1302, the other end is fixedly connected on two columns 13031 of the pedestal 1303 that voice coil motor circuit block 1304 comprised, 13032, because this circuit block 1304 and 1302 of this magnetic circuit component have forward suction, therefore can these all wire traction thing supports are straight, but make 1304 of magnetic circuit component 1302 and circuit blocks keep an air gap 1305, by geometrical analysis as can be known, the parallel limiting structure of at least two groups of this suspention support component is the configuration that an angle is arranged each other, can limit fully with aforementioned side direction lift-over inclination direction 1306 is the degree of freedom of axle rotation, and each parallel limiting structure has wire traction thing isometric and that be arranged in parallel, therefore, this magnetic circuit component 1302 must be followed the motor pattern of parallel rod, makes with respect to this circuit block 1304 and does not have friction and parallel relative displacement.

Two groups of suspention support components that are the parallel limiting structure of angle setting of above-mentioned use, can make side direction lift-over inclination angle does not take place fully, but, embodiment as shown in figure 14, when voice coil motor is subjected to perturbed force along arrow 1401 directions, skew along arrow 1401 directions can take place in this magnetic circuit component 1402, thereby cause a relative swing offset along the direction of arrow 1403, this relative swing offset is an instantaneous displacement, when perturbed force disappears it can be because of the minimum reluctance effect, reply original parallel state, this instantaneous relative swing offset also is unlikely to produce the lift-over inclination angle, therefore be applied to the optics imaging system and can't produce the burnt blooming of mistake, just the video picture scope can change, so this kind suspention support component can be applicable to stationary application, as is embedded in the voice coil motor of the automatic focusing camera module of mobile computer, its suffered vibrations interference and posture change are little, and the video picture scope that therefore this instantaneous relative swing offset caused is beated and not too can be taken place.

When voice coil motor of the present invention is applied to mancarried device, automatic focusing camera module as mobile phone, because of being subject to vibrations, disturbs in this device, and significant posture change is arranged during work, therefore must force the above-mentioned instantaneous relative swing offset of limitation voice coil motor moving part, below the circuit block that will variation sound coil motor how be described with several embodiment to be additionally providing the precompression of side direction guiding, and the wire traction thing that cooperates this increase is with this instantaneous relative swing offset of restriction.

First kind of embodiment, as shown in figure 15, wherein this coil 15011 of this circuit block 1501 and this magnetic conductor 15012 can be one and have the extension 1504 that coats towards a side of magnetic circuit component 1502 and keep an air gap 1503 with this magnetic circuit component 1502, this yoke 15012 that makes this extension 1504 and this magnetic circuit component 1502 produce the forward suction 1506 perpendicular to direction of displacement 1505 because of side direction magnetic circuit commissure, at this moment, the one wire traction thing 1507 that increases must be fixed in magnetic circuit component 1502 by an end, and the other end is fixed in the column 1508 with respect to the opposite side of this extension 1504.

Second kind of embodiment, as shown in figure 16, wherein this circuit block 1601 more can comprise a magnetic conductor 1603 of being located at the non-side towards circuit block 1601 of this magnetic circuit component 1602, this magnetic conductor 1603 and this magnetic circuit component 1602 produce the forward suction 1605 perpendicular to direction of displacement 1604 because of side direction magnetic circuit commissure, at this moment, the one wire traction thing 1606 that increases must be fixed in magnetic circuit component 1602 by an end, and the other end is fixed in the column 1607 with respect to the opposite side of this magnetic conductor 1603.

The third embodiment, as shown in figure 17, wherein this circuit block 1701 more can comprise a magnetite 1703 of being located at the non-side towards circuit block 1701 of this magnetic circuit component 1702, this magnetite 1703 is opposite with the polarity of this magnetic circuit component 1702, therefore this magnetite 1703 and this magnetic circuit component 1702 produce the forward suction 1705 perpendicular to direction of displacement 1704 because of side direction magnetic circuit commissure, at this moment, the one wire traction thing 1706 that increases must be fixed in magnetic circuit component 1702 by an end, and the other end is fixed in the column 1707 with respect to the opposite side of this magnetite 1703.

The 4th kind of embodiment, as shown in figure 18, wherein this circuit block 1801 more can comprise a magnetite 1803 of being located at the non-side towards circuit block 1801 of this magnetic circuit component 1802, this magnetite 1803 is identical with the polarity of this magnetic circuit component 1802, to produce the forward repulsion 1805 perpendicular to direction of displacement 1804, at this moment, a wire traction thing 1806 that increases must be fixed in magnetic circuit component 1802 by an end, and the other end is fixed in the column 1807 with respect to the same side of this magnetite 1803.

The 5th kind of embodiment, as shown in figure 19, wherein these magnetic conductor 19011 center lines 19013 of this circuit block 1901 can be with respect to the center line of this coil 19012 side of setovering, because these magnetic circuit component 1902 center lines 19021 have a departure thereby produce the side-to-side alignment power 1904 perpendicular to direction of displacement 1903 with these magnetic conductor 19011 center lines 19013, at this moment, the one wire traction thing 1905 that increases must be fixed in magnetic circuit component 1902 by an end, and the other end is fixed in the column 1906 corresponding to the opposite side of this biasing side.

The wire of above-mentioned relevant wire traction thing is described embodiment only proposed by the invention for convenience of description, certainly, this wire is drawn thing, and it more can be by laminar, strip traction thing replaces, and the material that should draw thing, be not defined as metal wire with conductive characteristic, it should be noted that, when the circuit block of voice coil motor is fixture, this traction thing can be nonconducting single etc., particularly by the line of multiply chemical fibre silk institute combination, as KEVLAR , it has superior damping characteristic and can bear quite high impact and do not produce fracture or permanent deformation, no matter but which kind of material only needs it along the low extensibility of forward coupling force direction tool, and when the moving member displacement, can free bend deformation and keep parallel motion person and get final product.In like manner, the a plurality of wire traction of the above-mentioned several use suspention support component that thing constituted, be embodiment proposed by the invention for convenience of description, be familiar with correlation technique person of the present invention, certainly can use above-mentioned idea to be combined into different configurations, be applied to automatic each embodiment of focusing mirror group that the portable optical device especially refers to phone camera module as following, anyway change, all must possess following characteristics, promptly this suspention support component comprises a plurality of traction things, and at least two these traction things be isometric and configured in parallel to constitute a parallel limiting structure.

Application scenario when voice coil motor, when its required displacement stroke is longer, the above-mentioned suspention support component that is made of a plurality of traction things can make magnetic circuit component increase excessively away from circuit block because of displacement, and be applied to many mirrors group's optics imaging system when voice coil motor, as Zoom lens system, these a plurality of mirror groups' optical axis must accurate overlap, and this makes that also the above-mentioned suspention support component that is made of a plurality of traction things is inapplicable.Therefore be necessary to invent new suspention support component, the present invention proposes two kinds of structures:

First kind of suspention support component is the sliding contact structure, shown in the structural profile schematic diagram of Figure 20 embodiment, this structure has one first contact-making surface groove 20011 in moving member 2001, and one second contact-making surface groove 20012, for making things convenient for the explanation of principle, this first contact-making surface groove 20011 is an example with the dihedral groove, and this second contact-making surface groove 20012 is an example with the flat bottomed recess; 2002 of this fixtures have the protruding thing 20021 of one first contact-making surface, and the protruding thing 20022 of one second contact-making surface, same, for making things convenient for the explanation of principle, the protruding thing 20021 of this first contact-making surface is an example with the protruding thing of semicircle, and the protruding thing 20022 of this second contact-making surface is an example with the protruding thing of semicircle also; When moving member 2001 utilizes the effect of aforementioned positive coupling power 2003 to combine with fixture 2002, the first contact-making surface groove 20011 can keep two lines to be contacted with the protruding thing 20021 of first contact-making surface, and the second contact-making surface groove 20012 is contacted with the protruding thing 20022 of second contact-making surface for single line, therefore, first reaction force 20041 that two contacts wire of the first contact-making surface groove 20011 and the protruding thing 20021 of first contact-making surface are produced and second reaction force 20042, because of being not parallel to forward coupling power 2003, make this two reaction force that component perpendicular to forward coupling power 2003 be arranged, the component of this two reaction force is self balancing guiding side force, the first contact-making surface groove 20011 is slided, so can effectively eliminate the free beat of side direction and the lift-over of moving member along protruding thing 20021 driving fits of first contact-making surface; And the second contact-making surface groove 20012 contacts for single line with the protruding thing 20022 of second contact-making surface, the reaction force 20043 of this contact wire must be parallel to forward coupling power 2003 and generating unit sub-support power, so limitation of no side direction, therefore, the protruding thing 20021 of first contact-making surface of the first contact-making surface groove 20011 of moving member 2001 and the second contact-making surface groove 20012 and fixture 2002, can put very widely with the relative normotopia degree tolerance of the protruding thing 20022 of second contact-making surface, the straight degree that guides straight degree only need control the first contact-making surface groove 20011 gets final product, a large amount of productions that this structure makes voice coil motor be applied to the portable consumer electronic product become quite easy, thereby significantly reduce cost; In addition, this structure is an open package assembly, and moving member combines with fixture, does not need accurate contraposition, makes things convenient for automated production.Certainly, the first contact-making surface groove 20011 among the figure is not limited to dihedral, it can be arc, the protruding thing 20021 of this first contact-making surface is not limited to semicircle, it can be square rod or pole constitutes, in this design spirit that will express be, only need keep both and be at least two lines or two sides contact that the component that makes its reaction force have vertical forward coupling power 2003 can reach above-mentioned free beat of nothing and lift-over effect; In like manner, the second contact-making surface groove 20012 is not limited to flat-bottom slot, the protruding thing 20022 of this second contact-making surface is not limited to semicircle, only need keep both for single line or single face contact at least, makes its reaction force be parallel to forward coupling power 2003 and can reach above-mentioned supporting role.

Second kind of suspention support component is the rolling contact structures, shown in the structural profile schematic diagram of Figure 21 embodiment, wherein moving member 2101 has one first contact-making surface groove 21011 and one second contact-making surface groove 21012, for making things convenient for the explanation of principle, this first contact-making surface groove 21011 is an example with the dihedral groove, and this second contact-making surface groove 21012 is an example with the dihedral groove also; This fixture 2102 also has one first contact-making surface groove 21021 and one second contact-making surface groove 21022, equally, for making things convenient for the explanation of principle, this first contact-making surface groove 21021 is an example with the dihedral groove, and this second contact-making surface groove 21022 is an example with the flat bottomed recess; The wherein first contact-making surface groove 21011 and at least two rolling elements of fixture 2,102 first contact-making surface grooves, 21021 clampings 2103 of moving member 2101, and the second contact-making surface groove 21012 and fixture 2,102 second contact-making surface grooves 21022 also at least two rolling elements of clamping 2104 of moving member 2101, for convenience of description, these rolling elements all are example with the spherical ball; Hereat when moving member 2101 utilizes the effect of forward idol power 2105 to combine with fixture 2102, the first contact-making surface groove 21011 of moving member 2101, first contact-making surface groove 21021 of fixture 2102 and the second contact-making surface groove 21012 of moving member 2101 are all at 2 and are contacted with arbitrary rolling element, and the second contact-making surface groove 21022 of fixture 2102 for single-point is contacted with arbitrary rolling element, therefore, 2 above-mentioned reaction forces that contact point produced, clearly, because of being not parallel to forward idol power 2105, make these reaction forces that component perpendicular to forward coupling power 2105 be arranged, these a little component are self balancing guiding side force, make moving member 2,101 first contact-making surface grooves 21011 utilize the rolling element 2103 of clamping to roll, so can effectively eliminate the free beat of side direction and the lift-over of moving member along the first contact-making surface groove, 21021 driving fits of fixture 2102; And the second contact-making surface groove 21022 of fixture 2102 is that single-point contacts with arbitrary rolling element, the reaction force of this contact point must be parallel to forward coupling power 2105 and generating unit sub-support power, and there is not the limitation of side direction, therefore, the first contact-making surface groove 21011 of moving member 2101 can be put very widely with the second contact-making surface groove 21012 and the first contact-making surface groove 21021 of fixture 2102 and the relative normotopia degree tolerance of the second contact-making surface groove 21022, therefore, this rolling guide structure also has the advantage of aforementioned sliding guide simultaneously, its difference only is to become rolling friction by sliding friction, and this exerts oneself limited for voice coil motor or location condition provides better solution than harsh occasion.Certainly, contact-making surface groove among the figure is not limited to dihedral groove or flat bottomed recess, it can be arc groove, and rolling element also can replace ball by roller, in this design spirit that will express be, only need keep wherein three contact-making surface grooves and rolling element and be or two lines at 2 contacts, make its reaction force have the component of vertical forward coupling power 2105, and wherein a contact-making surface groove is that single-point or single line contact with rolling element, its reaction force is parallel to forward coupling power 2105, can reach the guiding effect of free beat of above-mentioned nothing and lift-over.

By above-mentioned two kinds of overhung constructions amplification, when if voice coil motor is designed to rotatablely move, only need utilize two annulus contact-making surfaces is may command radial beat and lift-over, first kind of mode profile as shown in figure 22, for this suspention support component wherein comprises the guiding combination of the protruding thing 2202 of contact-making surface of the contact-making surface groove 2201 of annulus guiding and annulus guiding, first rigid body 2204 that comprises this circuit block 2203, and second rigid body 2206 that comprises this magnetic circuit component 2205.Wherein the contact-making surface groove 2201 of this annulus guiding can be disposed at this first rigid body 2204 or this second rigid body 2206 respectively with the protruding thing 2202 of contact-making surface of this annulus guiding, and 2202 of protruding things of contact-making surface that the contact-making surface groove 2201 of this annulus guiding and this annulus guide at least two lines or at least the two sides contact, its contact reaction force is removed provide the support component parallel, and the radial directed component perpendicular to this forward coupling power 2207 is provided with this forward coupling power 2207.Second way profile as shown in figure 23, this suspention support component comprises by the contact-making surface groove 2302 of the contact-making surface groove 2301 of first annulus guiding, the guiding of second annulus, and the guiding combination of a plurality of rolling elements 2303, first rigid body 2305 that comprises this circuit block 2304, and second rigid body 2307 that comprises this magnetic circuit component 2306.Wherein the contact-making surface groove 2301 of this first annulus guiding can be disposed at this first rigid body 2305 or this second rigid body 2307 respectively with the contact-making surface groove 2302 of this second annulus guiding, and at least three rolling elements of 2302 clampings of contact-making surface groove 2303 of guiding of the contact-making surface groove 2301 of this first annulus guiding and this second annulus wherein, and this rolling element 2303 of contact-making surface groove 2302 and each that the contact-making surface groove 2301 of this first annulus guiding and this second annulus guide contacts for 2 or two lines at least, its contact reaction force is removed provide the support component parallel, and the radial directed component perpendicular to this forward coupling power 2308 is provided with this forward coupling power 2308.

By aforesaid explanation as can be known, only need in any voice coil motor, the displacement control that provides a magnet spring power can reach open circuit, the generation of this magnet spring power can be to reach by the magnetic structure of voice coil motor own as described above, as Fig. 1 to Fig. 3; Certainly also can adopt existing voice coil motor to cooperate an extra magnetic circuit component that contains at least one magnetite and the configuration of a magnetic conductor, the magnetic field that makes this magnetic conductor place this magnetic circuit component to give birth to, this magnetic circuit component can be made of the magnetic circuit component of aforesaid four kinds of magnetic structures, certainly also an extra magnetic conductor can be placed the magnetic field of giving birth to by the magnetic circuit component of existing voice coil motor, as Fig. 4 A to Fig. 4 C, make this device have magnet spring power; Therefore, a kind of method that makes voice coil motor have magnet spring power must comprise following two steps:

A) in this voice coil motor, a magnetic conductor is set in the magnetic field that a magnetic circuit component that comprises at least one magnetite is given birth to;

B) make this magnetic conductor and this magnetic circuit component that one balance point of minimum reluctance generation be arranged along the direction of displacement of this voice coil motor, and when it had displacement with respect to this balance point, this magnetic field also increased progressively with the displacement increase through the equivalent magnetic resistance of this magnetic conductor institute closed magnet circuit.

Above-mentioned magnetic circuit component and magnetic conductor can be respectively be rigidly connected with the moving member and the fixture of existing voice coil motor.

This magnetic conductor is essentially ferroic material and constitutes, because it has certain conductivity, therefore, has certain damping, as being this damping of reinforcement, this method more can comprise one with the step of this magnetic conductor in conjunction with a conductive metal sheet, or this magnetic conductor more can be made by the powder metallurgy of the material that contains iron and conductivity composition, thus, because of magnetic resistance change given birth to the time become magnetic flux vortex flow will significantly increase, ohm that it caused decreases and then is a square doubly increase, thereby also strengthens damping characteristic.

Set forth make voice coil motor itself or additionally add magnetic conductor and magnetic circuit component with after producing magnet spring power, following the present invention will propose to utilize this magnet spring power to cooperate the propulsive force of coil generation, reach the method for displacement control, the control calcspar that please refer to Figure 24 obtains further to understand.

The first step of the method for this displacement control is taken a motor apparatus with magnet spring power, is example with the voice coil motor at this.

Second step of the method for this displacement control is that displacement command Pcmd is converted to equivalent current order Icmd according to magnet spring force constant Ks and motor strength constant K i, and its transfer equation formula is

Icmd＝(Ks/Ki)Pcmd

Wherein, magnet spring force constant Ks is defined as the magnet spring power that unit displacement produces, motor strength constant K i is defined as the propulsive force that unitary current produces, the value of this Ks/Ki is the producible displacement of unitary current, this conversion is equivalent current generation square 2401 execution that equaled Ks/Ki by a yield value, in fact, the coil of this voice coil motor can be passed to different electric currents, and the moving part displacement of measuring this voice coil motor get final product this yield value.

The third step of the method for this displacement control, be the current order input Iin that should equivalence current order Icmd inputs to power amplifier 2406, this power amplifier 2406 then outputs current to the coil 2407 of voice coil motor, and the propulsive force that this electric current is produced is equilibrated at this magnet spring power that is equivalent to displacement command Pcmd displacement.

This electric current by the two ends of this coil observe can be folk prescription to, at this moment, this motor is only moved towards single direction by aforementioned this minimum reluctance balance point; Certainly, this electric current more can be the twocouese electric current, at this moment, this motor can be moved towards two directions by this minimum reluctance balance point, this kind twocouese current drives pattern is observed by mains side having the voice coil motor of same magnetic spring force constant and the requirement of same displacement stroke, only needs this folk prescription to half of electric current, so can effectively reduce current drain, this is to being that the mancarried device of energy source is extremely important with the battery.

After the included basic step of the control method of having set forth open circuit, the voice coil motor of working as clearly exists if any error, for example, when voice coil motor is configured to move both vertically, this moving part is influenced by force of gravity to have a gravity to disturb, therefore, the propulsive force that the voice coil motor coil current is given birth to, necessary this gravity of balance and this magnet spring power simultaneously, just can make the voice coil motor moving part be positioned to required ad-hoc location, in fact, when voice coil motor applied to mancarried device, the relation of its direction of displacement and force of gravity direction can't be predicted, so, the control method of open circuit can only guarantee the displacement of its unitary current, and can't guarantee the locating effect of its absolute position in total travel, as desires to reach the absolute position locating effect and must take closed-loop path control, being used for estimating moving part is subjected to gravity to disturb the steady-state error that is caused, and order of corresponding alternate position spike offset current and above-mentioned current order is synthetic, eliminating this steady-state error, thereby reach the effect of location, absolute position.Therefore, above-mentioned displacement control method more can may further comprise the steps:

A) use a position transducer 2408 to measure the real time position of this voice coil motor moving part, obtain an equivalent real time position pfbk;

B) this displacement command Pcmd and this equivalence real time position are got a difference with 2409 computings of subtraction square, and this difference is comprised at least that by one the control computing square 2410 of an integration step obtains an alternate position spike offset current order Icomp; And

C) should equivalence current order Icmd and this alternate position spike offset current order Icomp by synthetic square 2405 additions.

The step B of the absolute position control method of above-mentioned closed-loop path) this control computing, can reach by single integral action step, being used for estimating moving part is subjected to gravity to disturb the steady-state error that is caused, certainly, transient response during for the reinforcement displacement, except above-mentioned integral action, more can comprising differentiates obtains the speed difference feedback, to strengthen damping characteristic.

Above-mentioned closed-loop path position control method, its employed position transducer can use existing optics chi, Photo Interrupter, reflective optical system, vortex flow proximity sense, laser distance measuring equipment etc.; But it should be noted that, as adopt Hall sensing component (Hall element) or magnetic-resistance sensing assembly (magnetoresistiveelement) for the advantage on being applied to have living space on the mancarried device, because of it can utilize the magnetic field of the magnetic circuit component of voice coil motor of the present invention itself, as sensed object with respect to displacement, and above-mentioned Hall sensing component or magnetic-resistance sensing assembly pressed close to this magnetic circuit component, so that the volume of single unit system is minimum, shown in Figure 28 as in the enforcement mode.

The above-mentioned open circuit displacement control method of the last extension of the present invention, a kind of position transducer, conductive metal sheet or damping glue of not needing proposed, can strengthen the control method of damping characteristic, this method is not only applicable to have the voice coil motor of magnet spring power, is applicable to the voice coil motor that uses elastomer deformation to obtain elastic force yet.

By Lenz's law as can be known, the back electromotive force of voice coil motor coil is directly proportional with relative displacement speed, this ratio is called the motor voltage constant, therefore enhancing damping characteristic control method of the present invention is promptly utilized and is measured this back electromotive force, signal as motor speed, utilize this signal enhancement system damping of feedback again, therefore, above-mentioned displacement control method more can may further comprise the steps:

Step 1 is to utilize back electromotive force conversion speed square 2402, measures the back-emf voltage E at coil 2407 two ends, is converted to the actual displacement speed v fbk of voice coil motor according to motor voltage constant K v.Its transfer equation formula is

vfbk＝E/Kv

Wherein, motor voltage constant K v is defined as the back-emf voltage that unit displacement speed is produced.

Step 2 is to utilize subtraction gain square 2404, a speed command vcmd and this actual displacement speed v fbk is subtracted each other obtain velocity error verr, and this velocity error verr is amplified with yield value G, obtains an enhancing damping current order Idamp, its mathematical notation formula

Idamp＝G*verr＝G*(vcmd-vfbk)

Step 3 is to utilize synthetic square 2405, and it is synthetic to strengthen damping current order Idamp and this equivalence current order Icmd, its mathematical notation formula Iin=Icmd+Idamp=Icmd+G*verr

By following formula as can be known, current order input Iin comprises two, be steady-state current item Icmd, and transient current item G*verr, wherein the propulsive force that produced of steady-state current item Icmd exactly equals the spring force under this required displacement, and transient current item G*verr compensates according to velocity error verr to make velocity error verr become zero, thereby reaches the effect of slowing down in advance and eliminating the stable state concussion, and the speed of eliminating concussion can reach by adjusting yield value G.

This speed command of above-mentioned steps two can be the equivalent command of zero velocity, and this moment, the mathematical notation formula was

verr＝0-vfbk＝-vfbk

This speed command of above-mentioned steps two can be one and utilizes differential square 2403, with in addition differential calculation of displacement command Pcmd, obtains this speed command vcmd.This moment, the mathematical notation formula was

verr＝(d/dt)Pcmd-vfbk

When the method for using voice coil motor of the present invention and open circuit displacement control during in CD-ROM or the displacement of DVD read head focusing mirror group, because this uses the upper and lower displacement except the focusing direction, also must possess the left and right displacement ability of seeking the rail direction, present embodiment explanation is when using the present invention in the most preferred embodiment of the displacement control device with two direction degrees of freedom:

As shown in figure 25, on one base 2501, a side is provided with a wall 25011 thereon, be provided with a plate circuit block 2502 that is rigidly connected in this base 2501 in opposite side, it comprises first coil 25021 and a dull and stereotyped yoke 25022, the one mobile seat 2503 with the hollow circle lens set that is used for locking is suspended in the top of this base 2501, its face magnetic circuit component that is rigidly connected towards this circuit block 2502, it comprises an arc yoke 25041, first magnetite 25042 and second magnetite 25043, these flat board yoke 25022 relative these magnetic circuit component have along first direction of arrow 2505 and along the magnet spring power of second direction of arrow 2506, this magnetic circuit component more can comprise extremely incorgruous the 3rd magnetite 25044 that magnetizes and the 4th magnetite 25045 be located at this move the seat 2503 relative first coils 25021 opposite side, in addition, this plate circuit block 2502, can comprise that more one second coil 25023 is located at the inner face of wall 25011, the both sides that should move seat 2503 more are provided with two groups of first parallel limiting structures 25031 that are arranged parallel, the second parallel limiting structure 25032, each parallel limiting structure is that the wire traction thing of and configured in parallel isometric by two is constituted, the two ends of each this wire traction thing are connected with mobile seat 2503 and this wall 25011 respectively, because first magnetite 25042 and second magnetite 25043 and 2502 of circuit blocks have a forward suction, this suction will support straight all four wire traction things, when first coil 25021 alives, the propulsive force that this electric current produced will with along first direction of arrow, 2505 magnet spring dynamic balances, make mobile seat 2503 do translation with respect to first coil 25021 along first direction of arrow 2505 abreast, when second coil 25023 alives, the propulsive force that this electric current produced will with the magnet spring dynamic balance along second direction of arrow 2506, make and move seat 2503 and do translation with respect to second coil 25023 along second direction of arrow 2506 abreast.

When the method for using voice coil motor of the present invention and open circuit displacement control in the portable optical device, especially refer to the automatic focusing mirror group displacement of mobile computer or phone camera module, must reach in the minimum rectangle perspective plane and implement the present invention, two kinds of following most preferred embodiments are arranged:

First kind of embodiment is the structure with outside plate circuit unit, as shown in figure 26, on one base 2601, a side is provided with a wall 2602 thereon, be provided with a plate circuit block 2604 that is rigidly connected in this base 2601 in opposite side, it is made up of a coil 26041 and a yoke 26042, the one mobile seat 2603 with the hollow circle lens set that is used for locking is suspended in the top of this base 2601, its face be rigidly connected first magnetic circuit component 2606 and second magnetic circuit component 2607 towards circuit block 2604, this two magnetic circuit component is two corners that are placed in relative hollow circle, make it have the minimum rectangle perspective plane, the both sides that should move seat 2603 are provided with two groups and are the first parallel limiting structure 26051 that an angle is settled, the second parallel limiting structure 26052, each parallel limiting structure is that the wire traction thing of and configured in parallel isometric by two is constituted, the two ends of each this wire traction thing are connected with mobile seat 2603 and this wall 2602 respectively, because this two magnetic circuit component 2606,2607 and 2604 of circuit blocks a forward suction is arranged, this suction will support straight all four wire traction things, and it is machine-processed to constitute the parallel suspention that prevents the side direction lift-over, when coil 26041 alives, the propulsive force that this electric current produced will with this yoke 26042 and magnetic circuit component 2606, the 2607 magnet spring dynamic balances of being given birth to, make with moving seat 2603 parallel no lift-over inclination angles and do translation, and reach the effect of open circuit displacement control with respect to circuit block 2604.

Second kind of embodiment has the structure of inner cylindrical circuit unit, as shown in figure 27, on one base 2701, it is provided with first wall 2702 and second wall 2703 in two sides, be provided with a cylindrical shape circuit block 2704 that is rigidly connected in this base 2701 in the center of this base 2701, it is made up of a coil 27041 and an arc yoke 27042, the one mobile seat 2705 with the hollow circle lens set that is used for locking is suspended in the top of this base 2701, three corners should moving seat 2,705 first magnetic circuit component 27061 that is rigidly connected, second magnetic circuit component 27062, the 3rd magnetic circuit component 27063 and the 4th corner are provided with a column 27064, make it have the minimum rectangle perspective plane, the adjacent both sides that should move seat 2705 are respectively equipped with the first parallel limiting structure 27071 and the second parallel limiting structure 27072, both are arranged perpendicular, each parallel limiting structure is that the wire traction thing of and configured in parallel isometric by two is constituted, the two ends of this wire traction thing of each of the first parallel limiting structure 27071 are connected with the column 27064 and first wall 2702 that move seat 2705 respectively, the two ends of this wire traction thing of each of the second parallel limiting structure 27072 are connected with the column 27064 and second wall 2703 that move seat 2705 respectively, because this first and the 3rd magnetic circuit component 27061,27063 and 2704 of circuit blocks a forward suction is arranged, this suction will support straight all four wire traction things, and it is machine-processed to constitute the parallel suspention that prevents the side direction lift-over, in addition, the center line of this yoke 27042 of this circuit block 2704 is with respect to first magnetic circuit component 27061 and 27063 biasings of the 3rd magnetic circuit component, can produce one along the direction of arrow 2708 to positive moment, therefore, must increase single line shape traction thing 2709, the two ends of this wire traction thing 2709 are connected with mobile seat 2705 and first wall 2702 respectively, this wire traction thing 2709 utilizes above-mentioned positive moment is supportted directly, to keep the parallel motion of skew without spin; When coil 27041 alives, the magnet spring dynamic balance that the propulsive force that this electric current produced will be given birth to this yoke 27042 and first magnetic circuit component 27061 and the 3rd magnetic circuit component 27063, make with moving seat 2705 parallel no lift-over inclination angles and do parallel motion, and reach the effect of open circuit displacement control with respect to circuit block 2704.

When the method for using voice coil motor of the present invention and closed-loop path Position Control in the portable optical device, especially refer to the automatic focusing mirror group displacement of phone camera module, must reach in the minimum rectangle perspective plane and implement the present invention, following most preferred embodiment is arranged:

As shown in figure 28, on one base 2801, it is provided with first column 2802 and second column 2803 in two diagonal angles, and be provided with a circuit block 2804 that is rigidly connected in this base 2801 in another angle, it is made up of a coil 28041 and a yoke 28042, the one mobile seat 2805 with the hollow circle lens set that is used for locking is suspended in the top of this base 2801, its face towards circuit block 2804 is inlayed the magnetic circuit component 2806 of an arc, make it have the minimum rectangle perspective plane, this first column 2802 and second column 2803 are provided with the first contact-making surface groove 28021 and the second contact-making surface groove 28031, seat 2805 be should move and the 3rd contact-making surface groove 28051 and the 4th contact-making surface groove 28052 were provided with respect to the first contact-making surface groove 28021 and the second contact-making surface groove 28031, wherein the first contact-making surface groove 28021 and 28051 clampings of the 3rd contact-making surface groove have first group of a plurality of ball 2807, and the second contact-making surface groove 28031 and 28052 clampings of the 4th contact-making surface groove have second group of a plurality of ball 2808, because this magnetic circuit component 2806 and 2804 of circuit blocks have a forward suction, utilize this above-mentioned groove of forward suction precompressed and ball, to produce reverse support force and side direction directed force, do parallel motion with respect to circuit block 2804 so that move ground, seat 2805 parallel no lift-over inclination angles; When coil 28041 alives, the magnet spring dynamic balance that the propulsive force that this electric current produced will be given birth to this yoke 28042 and magnetic circuit component 2806, in addition, this device is provided with the positioner 2810 of a position transducer 2809 and an integral action, this position transducer 2809 is to press close to the face of this magnetic circuit component 2806 by Hall sensing component or magnetic-resistance sensing assembly, so that the volume of single unit system is minimum, this position transducer 2809 is electrically connected at this positioner 2810, this positioner 2810 utilizes integral action to move the steady-state error that seat 2805 is caused because of the posture difference to compensate, and reaches the effect of closed-loop path Position Control.

More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.

Claims (22)

1. voice coil motor comprises:

One magnetic circuit component comprises at least one magnetite, is used for producing at least one magnetic field; And

One circuit block, comprise at least one coil, place this magnetic field and keep at least one air gap setting with this magnetic circuit component, this at least one coil passes to the propulsive force that an electric current and this at least one magnetic field reciprocation produce at least one direction, the relative motion that makes this magnetic circuit component and this circuit block reach at least one direction; It is characterized in that this circuit block more comprises at least one magnetic conductor, this magnetic conductor places the closed magnet circuit in this at least one magnetic field, and this magnetic circuit component produces the forward coupling power of at least one direction relatively; When this magnetic conductor and this magnetic circuit component have magnetic resistance change rate because of the relative motion of this at least one direction, produce the magnet spring power of at least one direction.

2. voice coil motor as claimed in claim 1, it is characterized in that, this magnetic circuit component more comprises at least one magnetic conductor, makes this magnetic field of being given birth to, can be in this magnetic circuit component towards this circuit block and form the pole surface of at least two opposed polarities adjacent to the surface of this air gap.

3. voice coil motor as claimed in claim 1 is characterized in that, this magnetic circuit component more is provided with at least one groove along this direction of relative movement in the surface towards this circuit block.

4. voice coil motor as claimed in claim 1 is characterized in that, this magnetic circuit component is that fixture and this circuit block are that moving member or this magnetic circuit component are that moving member and this circuit block are fixture.

5. voice coil motor as claimed in claim 1 is characterized in that, this magnetic conductor of this circuit block more is provided with at least one groove or shrinkage pool in the surface towards this magnetic circuit component.

6. voice coil motor as claimed in claim 1, it is characterized in that this magnetic conductor of this circuit block is the face that is parallel to each other in first side and second side of parallel this direction of relative movement, or be provided with the different face of at least one slope, or be provided with at least one cascaded surface.

7. voice coil motor as claimed in claim 1 is characterized in that, this magnetic conductor of this circuit block is in being provided with at least one cascaded surface towards this magnetic circuit component, or is provided with the different face of at least one slope.

8. voice coil motor as claimed in claim 1 is characterized in that, this magnetic conductor of this circuit block has more the extension that coats the non-side towards this circuit block of this magnetic circuit component, the perhaps center line of more relative this magnetic circuit component of center line of this magnetic conductor biasing.

9. voice coil motor as claimed in claim 1 is characterized in that, this circuit block more comprises at least one magnetic conductor or at least one magnetite in this magnetic field of being located at non-and the direct commissure of this coil.

10. voice coil motor as claimed in claim 1 is characterized in that, this circuit block comprises that more one is arranged at the conductive metal sheet in this magnetic field that this magnetic circuit component gives birth to.

11. as each described voice coil motor in the claim 1 to 10, it is characterized in that, more comprise a suspention support component, make this magnetic circuit component and this circuit block keep this air gap, and make this magnetic circuit component and this circuit block can keep a parallel relative motion, and utilize this forward coupling power precompressed or straight this suspention support component of support, inclination angle and play when eliminating this parallel relative motion.

12. voice coil motor as claimed in claim 11 is characterized in that, this suspention support component comprises a plurality of traction things, and at least two these traction things be isometric and configured in parallel to constitute a parallel limiting structure.

13. voice coil motor as claimed in claim 12, it is characterized in that, the material that this traction thing is flexible deformation constitutes, and it has first end points and second end points, this first end points is connected in first rigid body that this magnetic circuit component or this magnetic circuit component are included and be mutually permanently connected, and this second end points is connected in second rigid body that this circuit block or this circuit block are included and be mutually permanently connected; Perhaps, this traction thing is one to have the linking arm of first joint and second joint, this first joint is rotationally connected with first rigid body that this magnetic circuit component or this magnetic circuit component are included and be mutually permanently connected, and this second joint is rotationally connected with second rigid body that this circuit block or this circuit block are included and be mutually permanently connected.

14. voice coil motor as claimed in claim 11, it is characterized in that, this suspention support component comprises the first contact-making surface groove, the second contact-making surface groove, protruding thing of first contact-making surface and the protruding thing of second contact-making surface, this first contact-making surface groove and the protruding thing of this first contact-making surface corresponds respectively to this magnetic circuit component and this circuit block fixedly installs, and between this first contact-making surface groove and the protruding thing of this first contact-making surface for 2 or at least two lines or at least the two sides contact, this second contact-making surface groove and the protruding thing of this second contact-making surface corresponds respectively to this magnetic circuit component and this circuit block fixedly installs, and between this second contact-making surface groove and the protruding thing of second contact-making surface for more at least at least one line or at least one side contact.

15. voice coil motor as claimed in claim 11, it is characterized in that, this suspention support component comprises the first contact-making surface groove, the second contact-making surface groove, the 3rd contact-making surface groove, the 4th contact-making surface groove and a plurality of rolling element, this first contact-making surface groove and this second contact-making surface groove corresponds respectively to this magnetic circuit component and this circuit block fixedly installs, and at least two rolling elements of clamping between this first contact-making surface groove and this second contact-making surface groove, and this first contact-making surface groove and this second contact-making surface groove and each this rolling element contact for 2 or two lines at least, the 3rd contact-making surface groove and the 4th contact-making surface groove corresponds respectively to this magnetic circuit component and this circuit block fixedly installs, and at least two rolling elements of clamping between the 3rd contact-making surface groove and the 4th contact-making surface groove, and the 3rd contact-making surface groove and the 4th this rolling element of contact-making surface groove and each for more at least or at least one line contact.

16. voice coil motor as claimed in claim 11, it is characterized in that, this suspention support component comprises the contact-making surface groove of annulus guiding, the protruding thing of contact-making surface of annulus guiding, the protruding thing of contact-making surface of the contact-making surface groove of this annulus guiding and the guiding of this annulus corresponds respectively to this magnetic circuit component and this circuit block fixedly installs, and between the contact-making surface groove of this annulus guiding and the protruding thing of contact-making surface that this annulus guides at least two lines or at least the two sides contact.

17. voice coil motor as claimed in claim 11, it is characterized in that, this suspention support component comprises the contact-making surface groove of first annulus guiding, contact-making surface groove and a plurality of rolling element of the guiding of second annulus, the contact-making surface groove of the contact-making surface groove of this first annulus guiding and the guiding of this second annulus corresponds respectively to this magnetic circuit component and this circuit block fixedly installs, and clamping this a plurality of rolling elements between the contact-making surface groove of this first annulus guiding and the contact-making surface groove of this second annulus guiding, and this rolling element of contact-making surface groove and each of guiding of the contact-making surface groove that guides of this first annulus and this second annulus contacts for 2 or two lines at least.

18. a method that makes voice coil motor have magnet spring power is characterized in that, comprises the steps:

A) in this voice coil motor, a magnetic conductor is set in the magnetic field that a magnetic circuit component that comprises at least one magnetite is given birth to; And

B) make this magnetic conductor and this magnetic circuit component that one balance point of minimum reluctance generation be arranged along the direction of displacement of this voice coil motor, and when it had displacement with respect to this balance point, this magnetic field also increased progressively with the displacement increase through the equivalent magnetic resistance of this magnetic conductor institute closed magnet circuit.

19. the method that makes voice coil motor have magnet spring power as claimed in claim 18 is characterized in that it more comprises the step that a conductive metal sheet is placed this magnetic field.

20. a method of using magnet spring power to reach displacement control is characterized in that, may further comprise the steps:

A) take a motor apparatus with magnet spring power;

B) displacement command is converted to an equivalent current order according to the displacement that the unitary current of this motor apparatus produces; And

C) should the equivalence current order power amplifier that electrically connects of the coil of input one and this motor apparatus, make the propulsive force that coil current produced of this motor apparatus be equilibrated at this displacement command the magnet spring power of corresponding displacement.

21. use magnet spring power as claimed in claim 20 is reached the method for displacement control, it is characterized in that, for reaching the absolute position control of closed-loop path, more may further comprise the steps:

A) use a position transducer to measure the real time position of this motor apparatus moving part, obtain an equivalent real time position;

B) difference of this displacement command and this equivalence real time position is imposed one and comprise that at least the control computing of an integration step obtains an alternate position spike offset current order; And

C) this alternate position spike offset current order is added this equivalence current order.

22. use magnet spring power as claimed in claim 20 is reached the method for displacement control, it is characterized in that, more may further comprise the steps for strengthening damping characteristic:

A) measure the back electromotive force at the coil two ends of this motor apparatus, with the equivalent displacement speed of the moving part of obtaining this motor apparatus;

B) speed command or that is equivalent to zero velocity is subtracted each other by the speed command of this displacement command differential gained and this equivalence velocity of displacement obtain an equivalent velocity error, and should the equivalence velocity error amplify and obtain one and strengthen the damping current order with a ride gain value; And

C) should strengthen the damping current order and add this equivalence current order.

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