CN101056073A - Micro piezoelectric motor-lens integrated driving machine - Google Patents
Micro piezoelectric motor-lens integrated driving machine Download PDFInfo
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- CN101056073A CN101056073A CN 200710022415 CN200710022415A CN101056073A CN 101056073 A CN101056073 A CN 101056073A CN 200710022415 CN200710022415 CN 200710022415 CN 200710022415 A CN200710022415 A CN 200710022415A CN 101056073 A CN101056073 A CN 101056073A
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Abstract
The present invention relates to an integrated drive mechanism of tiny piezoelectric motor- lens piece including a ring-shaped piezoelectric stator, a rotor and a drive power supply. Wherein: an inner screw is positioned in the ring shape piezoelectric stator, and the rotor including external screw is ring shaped or cylinder shaped and is integrated as a whole with the lens piece; the external screw of the rotor is inosculated with the inner screw of the stator; the rotor is spun into the stator through the inosculated crew thread. The advantages are: a super-thin ring-shaped piezoelectric stator is provided, and the lens piece is driven directly as a part of the rotor; an opposite higher driving force and efficiency are provided; the screw thread transmission is not sensitive to the vibration; the motor can work at a lower voltage because the piezoelectric element on the piezoelectric stator is flaky or has a structure of multiple thin pieces; the device is especially adapted to the automatic focusing of the optical lens in the module of mobile telephones and minitype cameras because the motor and lens drive mechanism have less components, a small size and a low cost.
Description
Technical field
The invention belongs to accurate driving element technical field, particularly a kind of integrated driving by micro piezoelectric motor-lens.
Background technology
The piezoelectric micro motor is compared with traditional electromagnetic motor, especially in small size (millimeter～centimetre) scope, piezoelectric micro motor and piezoelectric actuator have shown the advantage of many uniquenesses, such as high relatively power density, big actuating force is with relative high efficient.As accurate driving element, piezo-electric motor and driver are just becoming some high-tech products such as mobile phone, the key element of medical image system and other micro medical equipment.The miniature driver of all these application need small sizes (from 1 millimeter to 1 centimetre), needed actuating force arrives milli ox rice (mNm) at little ox rice (μ Nm), and little power consumption (less than 0.1W).Many new Driving technique such as voice coil motor, piezoelectric actuator, piezo-electric supersonic micro-motor etc., have been developed and have been aimed at automatic focus and zoom in the camera cell phone.Slightly in the Driving technique, the piezoelectric micromotor motor is in resolution at this, and aspects such as actuating force and power consumption have demonstrated better feasibility, and accomplishes microminiaturization easilier.
Because the piezoelectric ultrasound motor of several cm size scopes successful be applied to traditional camera automatic focus and zoom, present many researchers have been devoted to develop the miniature piezoelectric ultrasonic motor as the little actuating of precision or little driving element be applied to miniature camera module, because the development of present camera cell phone is exceedingly fast, but lacks automatic focus and the zoom that an effective miniature accurate driving element is used for camera lens.Main cause is that traditional electromagnetic motor has become very difficult in the manufacturing of several millimeters magnitude sizes, and its efficient is in the only remaining a few percent (＜8%) of several mm sizes, because it lacks enough strong magnetic field.And the efficient of piezo-electric motor does not promptly have dimensional effect not have magnetic field problem yet.Even at mm size, piezo-electric motor also can be kept low speed and relative big torque factor.Other advantage of piezo-electric motor is: fast response, the friction lock behind the power shutoff, less elements and low cost.These features make piezo-electric motor possess the necessary condition of using in miniature camera module and camera cell phone.
The piezo-electric motor example application of two successes is annular and bar-shaped piezoelectricity traveling-wave ultrasonic motor (US Patent 5307102 of Canon Kabushiki Kaisha company development, US Patent5,387,835) they are applied to the Canon professional camera at present at large.But the size that this two breeds of horses reaches is all in several cm range, nor further is miniaturized into several mm sizes easily and is applied to the camera cell phone module.
Henderson has invented a kind of bar-shaped type and has operated in " Ho La hoop " (wobbling) linear piezoelectric motor (US Patent 6 of mode recently, 940,209), this motor has a pipe shape piezoelectric stator, and utilize two pairs of piezoelectric elements to produce " Ho La hoop " motion in two end, drive a screw rod that inserts in it by screw thread mechanism then and produce rectilinear motion.This screw rod is realized driving to camera lens by a bead that adheres to and flexure strip again.Though this motor can be made the bar-shaped structure of minor diameter, long length is arranged along the lens driving direction.This needs the camera lens module of superthin structure to some, obviously is disadvantageous.In addition, this motor also needs more machinery and piezoelectric element and high driving voltage, and this also is its weak point.
Another typical lens driver is a piezoelectric vibration bar system, by Minolta Co., and Ltd, company's invention (US Patent 6,836,057).This vibrational system is by a multi-layer piezoelectric actuator, and a thin rod and the camera lens that is enclosed within on the thin rod constitute.Be attached to the vibration that the piezo-activator on the thin rod relies on soon-replaces slowly, make the inertia force that acts on the camera lens bigger, thereby realize the driving of camera lens along long excellent a certain direction.The advantage of this piezo driven systems is relatively simple structure, with low operating voltage, shortcoming is this vibrational system along the lens driving direction, also needs long thin rod, and the efficient of inertia force type of drive is low, and vibrational system itself is vibration sensing to external world also.In addition, this long bar structure also is unfavorable for the application of ultra-thin mirror head module.
Another typical lens driver is the two vibration mode systems of a rectangle piezoelectricity L1-B2, be operated in the first rank compressional vibration pattern (L1) and the second rank beam mode (B2), by Seiko EpsonCorporation invention (US Patent 6,909,223).This vibrational system contains a rectangular metal plate and four piezoelectricity thin plates and is bonded on the metallic plate, is used to excite L1 and B2 pattern.Synthesizing in the end of metallic plate of these two kinds of patterns produces the standing wave with elliptic motion, and by the rotor rotation that friction-driven is in contact with it, approaches gear reduction and obtain big actuating force by one group again.The advantage of this piezo driven systems is low driving voltage, and shortcoming is complicated system.In addition, a system is worked simultaneously and remain on L1 and two kinds of mode of operations of B2 also are problematic, because the resonance frequency of these two kinds of mode of operations may cause asynchronous variation because of extraneous factor, thus the synthetic elliptic motion disorder that further causes piezoelectricity to produce, and driving was lost efficacy.
Therefore, be necessary to invent the precision that a kind of new piezo driven systems or piezo-electric motor and driver and new camera lens (or eyeglass) driving method be used for micro-lens and drive, and realize ultra-thinization of camera lens module.
Summary of the invention
The objective of the invention is to:, provide a kind of integrated driving of new micro piezoelectric motor-lens at the various drawbacks that piezo-electric motor exists in actual use.
The object of the present invention is achieved like this: a kind of integrated driving of micro piezoelectric motor-lens, comprise ring-type piezoelectric stator, rotor and driving power, it is characterized in that: the ring-type piezoelectric stator is provided with internal thread, rotor is for having externally threaded ring-type or cylindric, and rotor and eyeglass are integrated; Internal thread coincide on the external screw thread of its rotor and the stator; The be threaded into stator of described rotor by coincideing mutually.
In the technical scheme that the present invention relates to: described ring-type piezoelectric stator comprises one or a pair of piezoelectric ceramic ring and a becket; Said piezoelectric ceramic ring is that its electrode is an integral body, is hearth electrode along thickness direction polarization, and the another side electrode uniformly-spaced is divided into 〉=even number part of 4 by node, is top electrode.
In the technical scheme that the present invention relates to: the becket on the described ring-type piezoelectric stator contains a complete internal thread, or depend on 〉=4 the screwed entad feeler of even number, have externally threaded rotor and screw in stator by internal thread, or the stator that is threaded into by feeler entad.
In the technical scheme that the present invention relates to: said becket can be a thin ring, and its feeler is entad split in half, and said feeler along the circumferential direction has different height, and coincide with the external screw thread of said ring-type or cylindric rotor.
In the technical scheme that the present invention relates to: the piezo ceramic element of described piezoelectric ceramic ring can be a laminate structure more than; Electrode also is divided into 〉=even number part of 4 in it.
In the technical scheme that the present invention relates to: described ring-type piezoelectric stator produces one along diametric(al) expansion, vertical this diametric(al) stationary wave vibration pattern of shrinking under voltage signal drives, the stationary wave vibration pattern drives rotor by internal and external screw thread mechanism and does axial motion.
In the technical scheme that the present invention relates to: have and be integrated with driven one or a set of shots sheet in externally threaded ring-type or the cylindric rotor.
The invention has the advantages that: it provides a kind of ultra-thin ring-shaped structure of piezoelectric stator, and lens is as the direct method of driving of a rotor part, compare with traditional piezo driven systems based on the inertia force method, have: relative higher actuating force and efficient, its screw thread transmission mechanism also has vibrating insensitive; Piezoelectric element on the piezoelectric stator allow be made into laminar, or composite wafer structure, the tolerable motor is worked under low voltage; Because piezo-electric motor is an integrated superthin structure with being driven camera lens, motor and lens driving mechanism contain element still less, littler size and cost still less.Be particularly suitable for the automatic focus and the zoom of the optical lens in mobile phone and the miniature camera shutter module.
Description of drawings
Fig. 1 is one of embodiment of the invention general structure schematic diagram.
Fig. 2 is piezo-electric motor shown in Figure 1 and the profile that is driven lens 1B-1B along the line.
Fig. 3 has shown piezo-electric motor of the present invention operation principle in the clockwise direction.
Fig. 4 has shown that piezo-electric motor of the present invention is in counterclockwise operation principle.
Fig. 5 is two a cross-section structure of the embodiment of the invention.
Fig. 6 is three a cross-section structure of the embodiment of the invention.
Fig. 7 is four general structure schematic diagrames of the embodiment of the invention.
Fig. 8 is piezo-electric motor shown in Figure 7 and the profile that is driven lens 5B-5B along the line.
Fig. 9 is five general structure schematic diagrames of the embodiment of the invention.
Figure 10 is piezo-electric motor shown in Figure 9 and the profile that is driven lens 6B-6B along the line.
Figure 11 is six general structure schematic diagrames of the embodiment of the invention.
Among the figure: the 10-piezo-electric motor; 20-ring piezoelectric stator; 21-piezoelectric element ring; 21a, 21b, 21c, 21d-top electrode; The 22-becket; 22a, 22b, 22c, 22d-feeler; 22a ', 22b ', 22c ', 22d '-internal thread; 23a, 23b, 23c, 23d-node; The 30-rotor; The 30a-external screw thread; The 40-lens; 50,50a, 50b-driving voltage source; 1-1,2-2, expansion or contraction axis.
Embodiment
Accompanying drawing discloses part embodiment of the present invention without limitation, below in conjunction with specific embodiment the present invention is further described.
As seen from Figure 1: shown in piezo-electric motor 10 a ring piezoelectric stator 20 is arranged, have on the interior ring of this stator 〉=4 even number (present embodiment is four) feeler 22a, 22b, 22c and 22d entad, its end has internal thread 22a ', 22b ', 22c ' and 22d '.Motor 10 also contains a hollow cylinder type rotor 30, and external screw thread 30a is contained in its outside.The external screw thread of rotor 30 coincide with the internal thread of four feelers of stator, so rotor 30 can be threaded into the center of stator 20 by screw thread.Driven lens 40 is directly installed on the inside of cylindrical rotor 30.Fig. 2 is piezo-electric motor 10 shown in Figure 1 and the profile that is driven camera lens 40 1B-1B along the line.Said piezoelectric stator 20 further comprises piezoelectricity Pb (Zr
1-xTi
x) O
3(PZT) ceramic ring 21 or piezoelectricity Pb (Mg
1/3Nb
2/3) O
3-PbTiO
3(PMN-PT) or Pb (Zn
1/3Nb
2/3O)
3-PbTiO
3(PZN-PT) monocrystalline ring and a becket 22.Said piezoelectric ring 21 and becket 22 are combined with each other by adhering with epoxy resin.Said piezoelectric element ring 21 has hearth electrode (not having to show) and top electrode 21a who is divided into four parts of an integral body, b, c, and d.On principle, the top electrode 21 of piezoelectric ring can be divided into a plurality of even number parts, as 4,6,8 ... Deng.But consider for oversimplifying, select 4 here.Said piezoelectric element ring 21 is that the arrow P on it is represented polarised direction along the thickness direction polarization.When the AC signal voltage 50 of a suitable operating frequency is applied on the piezoelectric stator, piezoelectric stator will be by its a pair of feeler 22a and 22c (or 22b, d is used for driving in the other direction) rotation of driving rotor, again by thread mechanism 22a ', 22c ' and 30a drive its interior camera lens 40 of rotor and installation and move along the camera lens direction of principal axis.Piezoelectric stator 20 has four node location 23a, 23b, and 23c, and 23d can be used to the fixing motor stator and not worry losing the stationary wave vibration energy.In United States Patent (USP) (U.S.Patent 6,940,209,9/2005), Henderson has invented a long bar-shaped ultrasonic lead screw motor (ultrasonic lead screw motor).This motor utilizes four piezoelectric elements to be attached on the metallic cylinder, excite the first-order bending vibration that produces a rotation down at the pair of orthogonal voltage signal, i.e. " Ho La hoop " motion, the screw rod that screws in the cylinder by one of the screw drive that is attached to the metallic cylinder two ends produces rectilinear motion again.In this U.S.'s patent of invention, driven lens is to be attached on the metallic elastic sheet.The screw rod of motor drives this flexure strip by a bead, and realizes the driving to camera lens.Very clear, piezo-electric motor of the present invention and driven lens are integrated ultra-thin mechanisms, and the drive mechanism of camera lens is exactly the drive mechanism of motor, and this is that patent of the present invention significantly is different from the feature and advantage of existing patent in the past.In addition, patent of the present invention has simpler structure.
Fig. 3 and Fig. 4 have shown the driving method and the operation principle of this invention motor.Be applied to the pair of electrodes 21a and the 21c of piezoelectric element ring 21 when the AC signal voltage 50 of a suitable operating frequency, piezoelectric stator will produce a standing wave resonance vibration along the radial symmetric of the expansion of diameter line 1-1 direction, the contraction of 2-2 direction, this will cause feeler 22b and 22d to produce clockwise standing wave elliptical vibration, by the friction-driven rotor along counter rotation, the camera lens 40 that drives rotor by thread mechanism again and install in it is done the axial motion of camera lens, sees Fig. 3.Another that is applied to piezoelectric element ring 21 when this AC signal voltage 50 is to electrode 21b and 21d, piezoelectric stator will produce one along the expansion of diameter line 2-2 direction, 1-1 direction contraction vibration, cause feeler 22a and 22c to produce counterclockwise elliptical vibration, thereby drive rotor and camera lens is done reciprocal axial motion, see Fig. 4.By a pulse-width modulation circuit (not showing), control action that can be accurate is to the potential pulse number of piezoelectric stator, so the axial motion of controls lens that can be accurate.As seen, Fig. 3 and mode of operation of the present invention and driving method shown in Figure 4 also are to be different from the driving method of having invented.In addition, the present invention adopts standing wave method, and its benefit is only to need a drive voltage signal source, and this makes the frequency of drive circuit and piezoelectric stator be simplified with chasing after greatly.
Fig. 5 is the cross-section structure of another embodiment of the invention.Unique difference of it and embodiment illustrated in figures 1 and 2 is that this embodiment uses two thin piezoelectric element rings 21, and lower driving voltage and better radial symmetric vibration mode can be realized in the both sides that are bonded in becket 22 of their symmetries therefore.
Fig. 6 is the cross-section structure of another execution mode of the present invention.It is with the difference of the foregoing description: used a sandwich construction piezoelectric element ring 21 and a concentric becket 22 to bond together as motor stator.The interior electrode of sandwich construction piezoelectric element ring 21 also is divided into 4,6,8 ... part.Its mode of operation is identical with the shown mechanism of Fig. 3 and Fig. 4 with drive mechanism.The distinguishing feature of this embodiment is lower driving voltage.
Fig. 7 is the general structure schematic diagram of another execution mode of the present invention.The difference of it and the foregoing description is: this invention piezo-electric motor has a weak point and thin cylindric piezoelectric stator 20, compoundly constitutes by a thin outer piezoelectric element ring 21 and thin interior becket 22 are bonding.Thin piezoelectric ring also is that arrow P has been indicated its polarised direction along the thickness direction polarization.Electrode is an integral body in the thin piezoelectric ring, is used for ground electrode, and the external electrode of piezoelectric ring is divided into 4,6,8 ..., plurality of sections is used to apply voltage signal.In this invention example, external electrode is divided into 4 sections.Becket 22 also contains 〉=and 4 even number has entad feeler 22a, 22b, 22c and the 22d of internal thread.The rotor 30 of piezo-electric motor is built-in with lens 40, has screw thread 30a outward, and is threaded into the center of piezoelectric stator 20 by the internal thread of becket feeler.Fig. 8 is piezo-electric motor shown in Figure 7 and the profile that is driven lens 5B-5B along the line.The operation principle of present embodiment is identical with the operation principle of embodiment illustrated in figures 1 and 2, but compacter on the structure, and the overall diameter of motor stator is littler.
Fig. 9 is the general structure schematic diagram of another execution mode of the present invention.The places different with above inventive embodiments are that entad feeler 22a, 22b, 22c and 22d on the piezoelectric stator becket are split in half, and along the circumferential direction have different height, so that coincide with the external screw thread of rotor.The operation principle of this inventive embodiments is identical with the operation principle of one of inventive embodiments, but becket can be made of simpler die stamping method.Figure 10 is piezo-electric motor shown in Figure 9 and the profile that is driven lens 6B-6B along the line.
Figure 11 is six general structure schematic diagrames of the embodiment of the invention.The places different with above inventive embodiments are, the becket of motor stator does not have feeler, and the interior circle of becket contains full thread; Piezoelectric stator needs pair of orthogonal voltage signal 50a and 50b to drive, and relies on the row wave method to drive the rotor rotation, utilizes screw thread mechanism to make the camera lens of rotor and Qi Nei produce axial displacement then.The characteristics of this inventive embodiments are that metal stator is made simply, but need the pair of orthogonal drive voltage signal, and drive circuit is than standing wave method complexity.
Claims (7)
1, a kind of integrated driving of micro piezoelectric motor-lens, comprise ring-type piezoelectric stator, rotor and driving power, it is characterized in that: the ring-type piezoelectric stator is provided with internal thread, and rotor is for having externally threaded ring-type or cylindric, and rotor and eyeglass are integrated; Internal thread coincide on the external screw thread of its rotor and the stator; The be threaded into stator of described rotor by coincideing mutually.
2, the integrated driving of micro piezoelectric motor-eyeglass according to claim 1 is characterized in that: described ring-type piezoelectric stator comprises one or a pair of piezoelectric ceramic ring and a becket; Said piezoelectric ceramic ring is that its electrode is an integral body, is hearth electrode along thickness direction polarization, and the another side electrode uniformly-spaced is divided into 〉=even number part of 4 by node, is top electrode.
3, the integrated driving of micro piezoelectric motor-lens according to claim 2, it is characterized in that: the becket on the described ring-type piezoelectric stator contains a complete internal thread, or depend on 〉=4 the screwed entad feeler of even number, have externally threaded rotor and screw in stator by internal thread, or the stator that is threaded into by feeler entad.
4, the integrated driving of micro piezoelectric motor-lens according to claim 3, it is characterized in that: said becket can be a thin ring, its feeler is entad split in half, said feeler along the circumferential direction has different height, and coincide with the external screw thread of said ring-type or cylindric rotor.
5, the integrated driving of micro piezoelectric motor-lens according to claim 2 is characterized in that: the piezo ceramic element of described piezoelectric ceramic ring can be a laminate structure more than; Electrode also is divided into 〉=even number part of 4 in it.
6, according to the integrated driving of claim 1 or 2 or 3 or 4 or 5 described micro piezoelectric motor-lens, it is characterized in that: described ring-type piezoelectric stator produces one along diametric(al) expansion, vertical this diametric(al) stationary wave vibration pattern of shrinking under voltage signal drives, the stationary wave vibration pattern drives rotor by internal and external screw thread mechanism and does axial motion.
7, the integrated driving of micro piezoelectric motor-eyeglass according to claim 1 is characterized in that: have and be integrated with driven one or a set of contact lenses in externally threaded ring-type or the cylindric rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100224159A CN101056073B (en) | 2007-05-18 | 2007-05-18 | Micro piezoelectric motor-lens integrated driving machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100224159A CN101056073B (en) | 2007-05-18 | 2007-05-18 | Micro piezoelectric motor-lens integrated driving machine |
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| CN101056073A true CN101056073A (en) | 2007-10-17 |
| CN101056073B CN101056073B (en) | 2010-04-14 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7831139B2 (en) | 2008-01-28 | 2010-11-09 | Hon Hai Precision Industry Co., Ltd. | Camera module with lens carrying structure using electrostatic driving unit |
| WO2015103821A1 (en) * | 2014-01-08 | 2015-07-16 | 博立多媒体控股有限公司 | Zoom lens driving device and zoom lens |
| CN113885110A (en) * | 2021-09-30 | 2022-01-04 | 珠海格力电器股份有限公司 | Liquid lens, electronic equipment and zooming method of liquid lens |
| CN115199901A (en) * | 2022-08-17 | 2022-10-18 | 东漫(上海)电子科技有限公司 | Projection device with angle correction function |
| CN116107135A (en) * | 2023-02-20 | 2023-05-12 | 哈尔滨工业大学 | Centimeter-level optical imaging system driven by ultrasonic motor and driving method |
-
2007
- 2007-05-18 CN CN2007100224159A patent/CN101056073B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7831139B2 (en) | 2008-01-28 | 2010-11-09 | Hon Hai Precision Industry Co., Ltd. | Camera module with lens carrying structure using electrostatic driving unit |
| CN101498823B (en) * | 2008-01-28 | 2011-03-30 | 鸿富锦精密工业（深圳）有限公司 | Camera module group |
| WO2015103821A1 (en) * | 2014-01-08 | 2015-07-16 | 博立多媒体控股有限公司 | Zoom lens driving device and zoom lens |
| CN113885110A (en) * | 2021-09-30 | 2022-01-04 | 珠海格力电器股份有限公司 | Liquid lens, electronic equipment and zooming method of liquid lens |
| CN115199901A (en) * | 2022-08-17 | 2022-10-18 | 东漫(上海)电子科技有限公司 | Projection device with angle correction function |
| CN116107135A (en) * | 2023-02-20 | 2023-05-12 | 哈尔滨工业大学 | Centimeter-level optical imaging system driven by ultrasonic motor and driving method |
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