CN1858975B - Voice coil motor device - Google Patents
Voice coil motor device Download PDFInfo
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- CN1858975B CN1858975B CN2005100701568A CN200510070156A CN1858975B CN 1858975 B CN1858975 B CN 1858975B CN 2005100701568 A CN2005100701568 A CN 2005100701568A CN 200510070156 A CN200510070156 A CN 200510070156A CN 1858975 B CN1858975 B CN 1858975B
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- voice coil
- coil motor
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Abstract
本发明是关于一种音圈马达装置，特别是指一种可应用于微型相机自动对焦或变焦镜组驱动的音圈马达装置。该装置包括一音圈马达，多个导引钢轴，一负载安装滑座及一底座。该音圈马达包含一由磁铁及轭铁所构成的磁路部件，及一由线圈所构成的电路部件；该磁路部件与该负载安装滑座刚性连接做为本装置的动件，该电路部件与导引钢轴固定于该底座为本装置的非动件；本装置的特征为，通过该音圈马达磁路部件本身漏磁场与导引钢轴交链产生的磁预压力以消除动件与非动件间公差间隙所造成的自由偏摆，以达高重现性的运动性能；此外，该磁路部件的磁铁及轭铁形成具有矩形外型的非全圆包覆的磁路结构，以达成整体装置最小化。
The present invention relates to a voice coil motor device, and more particularly to a voice coil motor device that can be used for driving the autofocus or zoom lens group of a miniature camera. The device includes a voice coil motor, a plurality of guide steel shafts, a load mounting slide and a base. The voice coil motor includes a magnetic circuit component composed of a magnet and a yoke, and a circuit component composed of a coil; the magnetic circuit component is rigidly connected to the load mounting slide as the moving part of the device, and the circuit component and the guide steel shaft are fixed to the base as the non-moving part of the device; the device is characterized in that the magnetic pre-pressure generated by the leakage magnetic field of the voice coil motor magnetic circuit component itself and the guide steel shaft are interlinked to eliminate the free deflection caused by the tolerance gap between the moving part and the non-moving part, so as to achieve high reproducibility of motion performance; in addition, the magnet and yoke of the magnetic circuit component form a non-circular magnetic circuit structure with a rectangular appearance, so as to minimize the overall device.
Description
Technical field
The present invention is meant a kind of microminiaturized voice coil motor with the accurate guiding of magnetic precompression formula, is meant a kind of voice coil motor that micro-camera mirror group drives that can be applicable to especially.
Background technology
Existing cylinder type voice coil motor, as shown in Figure 5, comprise a concentric ring yoke 51 with U type cross section, several sections arc-shaped magnets 52 are affixed on the inner face of concentric ring yoke in this U type cross section to constitute magnetic confining field, one coil 53 places above-mentioned magnet 52 and yoke 51 formed air gaps 54, when coil 53 passes to electric current, this electric current can produce thrust with the magnetic field reciprocation in the air gap 54.For making coil 53 in air gap, keep uniform gap with magnet 52 and yoke 51, there are several to seize guide mode on both sides by the arms, one is for using an accurate sleeve slide-bar, its sleeve part and yoke 51 are rigidly connected, and coil 53 is rigidly connected with axial region, because this precision sleeve slide-bar has the rolling steel ball of precompressed, Gu but the contactless accurate parallel sliding of hold-in winding and yoke; Its two for when the displacement of coil relatively very in short-term, can adopt two spring leafs and coil 53 to be rigidly connected, if two spring leafs have identical elastic constant, also can reach the contactless accurate parallel motion of coil 53 and yoke 51 in theory; It three is application for non-precision, coil 53 can be fixed in a sliding sleeve, the outer rim sliding contact of the inner edge of this sleeve and yoke 51 makes coil 53 and yoke 51 reach contactless slip, and its motion depth of parallelism and frictional force are determined by interior outer rim tolerance clearance.
When existing voice coil motor is applied to that following bottleneck is arranged when micro-camera mirror group drives:
(a) camera lens that voice coil motor drove is an object movably, driving camera lens by voice coil motor does and moves forward and backward the purpose that reaches automatic focusing or zoom, this uses except that the location of the high fidelity of needs, still needs and do high-precision requirement to meet the performance of optical imagery on the relative beat with optical axis of kinematic axis.If adopt first method of above-mentioned existing mode, though its motion fidelity and frictional force performance are excellent, cost that should precision sleeve slide-bar is too high and microminiaturized bottleneck arranged, and this is to real in infeasible under the volume production prerequisite that is applied to micro-camera; If adopt second method of above-mentioned existing mode, when two spring leaf elasticity are that number is variant, or several sections arc-shaped magnets are variant towards magnetic intensity, all will cause beat to a certain degree and influence the imaging quality that is applied to micro-camera, in addition, more seriously, if be applied to the Portable micro-camera, the deadweight direction of camera lens, also can cause the motion beat, therefore, adopt this method on volume production, may cause the not high shortcoming of yield, the micro-camera of high picture element will be used for future, and its deadweight beat will obviously worsen the imaging quality; If adopt the three therapeutic methods of traditional Chinese medicine of above-mentioned existing mode, by the constraint of the strict assembly tolerance between moving part and non-moving part contact-making surface reach kinematic axis to beat control, when this drives the mirror group that is applied to compact camera module, because voice coil motor is directly exerted oneself limited and each die cavity ejection shaping die precision homogeneous chemical control system is difficult for, this will cause on the volume production single unit system moving part of assembly and the quality instability of frictional force between non-moving part and motion deflection angle at random, tolerance too tightly makes the excessive voice coil motor that causes of frictional force drive, and tolerance too pine will make the excessive reduction imaging of free deflection angle quality.In sum, be necessary to create the low-cost guide mechanism of a kind of frictional force and deflection angle and moving part and non-moving part assembly tolerance and mirror group deadweight orientation independent, make the voice coil motor volume production that is applied to the driving of compact camera module mirror group become feasible.
(b) be applied to the demand of portable apparatus in response to micro-camera mirror group, module size be miniaturized as trend on the market, to adapt to existing portable apparatus dimensional space restriction, but existing voice coil motor is the framework of circle symmetry, therefore the microminiaturization meeting of size is restricted microminiaturization because of the manufacturing limit of slim magnet production, therefore how to reach the realistic creation problem of attaching most importance to and wanting of wanting of above-mentioned size microminiaturization from the breakthrough of motor magnetic Circuit Design framework.
Summary of the invention
Main purpose of the present invention is to propose a kind of low-cost microminiaturized voice coil motor that magnetic precompression formula does not have free beat guide mechanism that has, to improve shortcoming and the bottleneck that is caused when existing voice coil motor is applied to the driving of micro-camera mirror group.
Voice coil motor of the present invention, it is characterized by the magnetic precompression that utilizes the magnetic structure leakage field of voice coil motor own that the guiding rod iron is produced, to make frictional force be constant, and eliminate gap between the contact-making surface of moving part and non-moving part, so that the mirror group at the motion result that carries out can obtaining low friction when mobile, not having free beat, high fidelity; Another feature is for this voice coil motor has the magnetic structure that the non-wholecircle of rectangular shape coats, and makes under the restriction of fixing length and width, by the concentrated magnetic structure of flux, reaches maximum motor thrust.This voice coil motor comprises a voice coil motor magnetic circuit component, a voice coil motor circuit block, a plurality of guiding steel axle, and slide is installed in a load, and a base.
Certainly, this voice coil motor magnetic circuit component wherein, it is to be stacked over an outer rim with end yoke of central ring wall by a plurality of non-ring magnets, a plurality of non-ring-like surperficial yoke tenuto coil motor axial direction to make and form ring air gap between this non-ring-like surperficial yoke inner edge and this central authorities' ring wall, it is characterized by the magnetic structure that magnetic circuit component has the non-wholecircle coating of rectangular shape, and the ring air gap forms in order to produce the main excitatory magnetic field of thrust in this, and the outer rim that reaches this magnetic circuit component forms in order to produce the stray field of magnetic precompression.
Certainly, this voice coil motor circuit block wherein, it is made of at least one group of coil, can flow through suitable electric current in this coil and be placed on above-mentioned this magnetic circuit component should in ring air gap with above-mentioned should main excitatory magnetic field effect generation thrust.
Certainly, wherein slide is installed in this load, be rigidly connected to constitute the moving part of this device with above-mentioned this magnetic circuit component, it removes has a hollow internal screw thread in order to the locking load, and its outer rim also has a plurality of circle hole shapes or open arc breasting face and this a plurality of guiding steel axle sliding contact.
Certainly, these a plurality of guiding steel axles wherein, it is made of permeability magnetic material, be placed in above-mentioned this load a plurality of circle hole shapes or the open arc breasting face inner edge of slide are installed, and keep a gap respectively by the outer rim of these a plurality of circle hole shapes or open arc breasting face and above-mentioned this magnetic circuit component, this stray field that above-mentioned this magnetic circuit component produced, see through this gap, with these a plurality of guiding steel axle magnetic interlinkages, produce the magnetic precompression to constitute closed magnet circuit, the formed resultant moment of this magnetic precompression, with making above-mentioned this load a plurality of circle hole shapes or the open arc breasting face of slide are installed, these a plurality of guiding steel axles of the tight sliding contact of difference are to reach the sliding motion of no free beat.
Certainly, wherein this base in order to fixing above-mentioned this voice coil motor circuit block and above-mentioned these a plurality of guiding steel axles, forms the non-moving part of this device.
Now, consult appended diagram by following detailed description and obtain preferable understanding now at each thin portion technology contents of the present invention:
Description of drawings
Fig. 1: the magnetic structure schematic diagram that apparatus of the present invention adopt the non-wholecircle of the rectangle of two magnetites to coat;
Fig. 2: the magnetic structure schematic diagram that apparatus of the present invention adopt the non-wholecircle of the rectangle of four magnetites to coat;
Fig. 3: apparatus of the present invention magnetic precompression formula does not have the guiding structural key diagram of free beat;
Fig. 4: the mechanism map of the preferred embodiment of apparatus of the present invention;
Fig. 5: existing cylinder type voice coil motor magnetic structure schematic diagram.
Embodiment
Voice coil motor magnetic circuit component among the present invention, as shown in Figure 1, this magnetic circuit component is to be made up of with the end yoke 13 tenuto coil motor axial direction institute storehouses with central ring wall two non-ring-like magnetite 111,112, two non-ring-like surperficial yokes 121,122; The magnetic structure that this non-wholecircle with rectangular shape coats can form two kinds of closed magnetic paths, one is by this two non-ring-like magnetite 111 in order to the main magnetic line of force 15 that produces thrust, 112 upper surface sets out, via two non-ring-like surperficial yokes 121,122 turn to interior ring air gap 14, arrive the central ring wall of end yoke 13, at the lower surface of getting back to these two non-ring-like magnetites 111,112 via the guiding of end yoke 13; And another leakage field line of force 16 in order to generation magnetic precompression is by this two non-ring-like magnetite 111,112 upper surface sets out, via non-ring-like surperficial yoke 121,122 turn to outer rim, pass through these surface yoke 121,122 outer rims and end yoke 13 outer intermarginal air portion, arrive end yoke 13 outer rims, at the lower surface of getting back to this non-in twos ring-like magnetite 111,112 via the guiding of this end yoke 13.The characteristic of this magnetic structure is can be under the spatial limitation of specific open circles diameter and whole length and width, four corners that make full use of defined rectangular area are provided with magnetite, utilize this two non-ring-like surperficial yoke 121,122 reach the effect that flux is concentrated, therefore compared to the symmetrical magnetic structure of existing circle, specific exert oneself require under, can realize the design of minimum length and width, simultaneously the also bottleneck of the too thin difficult production of magnetite during the solving device microminiaturization.Certainly, extend this notion, this magnetic circuit component also can be made up of with the end yoke 23 with central ring wall four non-ring-like magnetite 211,212,213,214, four non-ring-like surperficial yokes 221,222,223,224 as shown in Figure 2.
Voice coil motor circuit block among the present invention, it is constituted and is fixed on above-mentioned this base by coil, and place the interior ring air gap 14 of above-mentioned this magnetic circuit component, when the coil midstream overcurrent, can produce thrust with main magnetic line of force reciprocation, this fixed coil formula voice coil motor framework, can omit existing voice coil motor and move service cable, promote the life-span reliability of this device.
Voice coil motor among the present invention is reached the drive characteristic that the magnetic force prepressing type does not have free beat, as shown in Figure 3, is slide 31 to be installed in this load be rigidly connected with above-mentioned this magnetic circuit component 32, with the moving part as this voice coil motor.The coil 33 of this voice coil motor and two guiding steel axles 341,342 are individually fixed in base 35 to constitute the non-moving part of this voice coil motor.Because this two guidings steel axle 341, the 342nd, place and separate from two arc breasting faces 311 that slide 31 is installed in this load, in 312, and keep a gap 36 respectively with above-mentioned magnetic circuit component 32 outer rims, because the described magnetic circuit component 32 of leading portion has the leakage field line of force 37 of the outer rim of passing through, this leakage field line of force this two guidings steel axle 341 of can flowing through, 342 and constitute closed magnet circuit, therefore this moving part has magnetic precompression 381 in the face of the face of this two guidings steel axle, 382 produce, thereby this moving part produced a resultant moment, two arc breasting faces 311,312 that this resultant moment can make above-mentioned this load that slide 31 is installed are close to the surface of this two guidings steel axle 341,342, even so this two guidings steel axle 341, the center of 342 center or external diameter and this arc breasting face 311,312 or radius have tolerance and form the gap, heal little its value more greatly because magnetic force is air gap, therefore this moving part can be partial to the less arc breasting face of air gap, and with another breasting face only retention wire contact; The guiding design of this innovation can make the sliding motion of the relative motion of moving part and non-moving part for no free beat, improve the location fidelity of this voice coil motor, in addition, this guiding structural also reduces this two guidings steel axle 341,342 assembling depth of parallelism requirement, and the frictional force that makes this guiding structural is only relevant with the magnetic precompression and irrelevant with the assembling tolerance, improves the yield of this voice coil motor volume production.
In sum, disclosed voice coil motor by the technological means of following creation, makes voice coil motor reach microminiaturized easily volume production and does not have the exercise performance of free beat:
(a) magnetic structure that coats with non-wholecircle with rectangular shape reach specific exert oneself require under, can realize the design of minimum length and width, and the bottleneck of the too thin difficult production of magnetite during the solving device microminiaturization.。
(b) stray field that is produced by the magnetic circuit component of voice coil motor own produces the magnetic precompression is reached no free beat with the tolerance clearance between elimination moving part and non-moving sliding capability via guiding steel axle.
When being applied to the driving of micro-camera mirror group usually according to the present invention, its preferred embodiment is as described below:
As shown in Figure 4, this voice coil motor comprises a coil 41, the first guiding steel axle 421 and the second guiding steel axle 422 are individually fixed on the base 43, constitute the non-moving part of this device, this device also comprises that a magnetic circuit component 44 is rigidly connected in a load and slide 45 is installed together with the mirror group 46 that is fixed thereon, constitute the moving part of this device, wherein this magnetic circuit component 44 is by the first non-ring magnet 441 and the second non-ring magnet 442, the first non-ring-like surperficial yoke 443 and the second non-ring-like surperficial yoke 444 are stacked over an outer rim with end yoke 445 of central ring wall and have the magnetic structure that the non-wholecircle of rectangular shape coats with formation, to reduce the length and width of single unit system.This coil 41 just places the formed interior ring air gap of above-mentioned magnetic circuit component, in order to produce thrust by electric current; In this load install on slide 45 symmetrical corner be provided with the first arc breasting face 451 and the second arc breasting face 452 in order to above-mentioned two guiding steel axles 421,422, the leakage field line of force by this magnetic circuit component 44 produces the magnetic precompression, and then keeps tight sliding contact.Hereat when the moving part of voice coil motor produces relative motion because of thrust makes with non-moving part, do not have free beat and produce.
The present invention must be thought and is to modify right neither taking off as Protector that attached claim is desired as all by the personage Ren Shi craftsman who is familiar with this skill.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100701568A CN1858975B (en) | 2005-05-08 | 2005-05-08 | Voice coil motor device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100701568A CN1858975B (en) | 2005-05-08 | 2005-05-08 | Voice coil motor device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1858975A CN1858975A (en) | 2006-11-08 |
| CN1858975B true CN1858975B (en) | 2010-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005100701568A Expired - Fee Related CN1858975B (en) | 2005-05-08 | 2005-05-08 | Voice coil motor device |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101324689B (en) * | 2007-06-12 | 2010-10-13 | 华宏新技股份有限公司 | Voice coil motor device |
| CN101483376B (en) * | 2008-01-10 | 2011-05-18 | 财团法人工业技术研究院 | Voice coil motor |
| CN101604886B (en) * | 2008-06-10 | 2012-07-18 | 鸿富锦精密工业（深圳）有限公司 | Fixing device |
| US8355628B2 (en) * | 2009-03-06 | 2013-01-15 | Visera Technologies Company Limited | Compact camera module |
| CN102468735A (en) * | 2010-10-29 | 2012-05-23 | 吉佳科技股份有限公司 | Voice coil motor for stable moving parts |
| TWI504109B (en) * | 2013-08-06 | 2015-10-11 | Vasstek Int Corp | Can move the moving sound of the voice coil motor |
| US10382698B2 (en) | 2015-09-30 | 2019-08-13 | Apple Inc. | Mobile zoom using multiple optical image stabilization cameras |
| CN105699898B (en) * | 2016-04-14 | 2018-08-17 | 昆山丘钛微电子科技有限公司 | VCM motor floats high test device and test method |
| CN107147272A (en) * | 2017-06-23 | 2017-09-08 | 江苏新鑫星科技有限公司 | A kind of loop circuit voice coil motor |
| CN119310701A (en) * | 2023-07-13 | 2025-01-14 | 陆圣 | Optical drive |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3157048A (en) * | 1961-07-03 | 1964-11-17 | Trans Sonics Inc | Digital tank gaging system |
| US5220461A (en) * | 1990-09-10 | 1993-06-15 | Sony Corporation | Lens barrel apparatus for automatic focusing |
| US6134058A (en) * | 1998-07-03 | 2000-10-17 | Matsushita Electric Industrial Co., Ltd. | Object lens driving device |
| US6532118B2 (en) * | 2000-12-13 | 2003-03-11 | Ricoh Company, Ltd. | Objective lens actuating device |
-
2005
- 2005-05-08 CN CN2005100701568A patent/CN1858975B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3157048A (en) * | 1961-07-03 | 1964-11-17 | Trans Sonics Inc | Digital tank gaging system |
| US5220461A (en) * | 1990-09-10 | 1993-06-15 | Sony Corporation | Lens barrel apparatus for automatic focusing |
| US6134058A (en) * | 1998-07-03 | 2000-10-17 | Matsushita Electric Industrial Co., Ltd. | Object lens driving device |
| US6532118B2 (en) * | 2000-12-13 | 2003-03-11 | Ricoh Company, Ltd. | Objective lens actuating device |
Non-Patent Citations (4)
| Title |
|---|
| JP实开平5-90418U 1993.12.10 |
| JP平1-173714U 1989.12.11 |
| JP平4-6281U 1992.01.21 |
| JP特开平5-181051A 1993.07.23 |
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