CN100454132C - Positioning device of voice coil motor - Google Patents
Positioning device of voice coil motor Download PDFInfo
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- CN100454132C CN100454132C CNB2004100808804A CN200410080880A CN100454132C CN 100454132 C CN100454132 C CN 100454132C CN B2004100808804 A CNB2004100808804 A CN B2004100808804A CN 200410080880 A CN200410080880 A CN 200410080880A CN 100454132 C CN100454132 C CN 100454132C
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Abstract
The present invention relates to a positioning device of a voice coil motor, particularly to a voice coil motor positioning device which is applied to drive an automatic focusing lens group of a miniature camera. The device comprises a voice coil motor, a position feedback transducer and a positioning controller, wherein coils of the voice coil motor can be used as moving parts, and a power supply cable is composed of a flexible printed circuit board with a board-shaped swirl shape. The coils of the voice coil motor can be used as fixing parts, and the power supply cable is a fixing cable. The position feedback transducer comprises a light chopper, a light source reflecting board which is provided with completely white color blocks or black and white combining color blocks, and a specific biasing circuit. The position feedback transducer is used for detecting the continuous displacement of the moving parts of the voice coil motor. The positioning controller receives signals of the feedback transducer and can accurately control the displacement of the voice coil motor through proportion operation, differential operation, integral operation and a power amplifier.
Description
Technical field
The present invention relates to a kind of voice coil motor precision positioning device of easy microminiaturization, particularly a kind of micro-camera positioning device of voice coil motor that the mirror group drives of focusing automatically that can be applicable to.
Background technology
The formation of conventional art voice coil motor, as shown in Figure 9, fixed part is made up of magnet 911 and soft iron 912, be used for stablizing excitatory magnetic field in air gap 913 generations of magnetic loop, and be fixed on the substrate 92, moving part is made up of a coil 931 and a service cable 932 that an enameled wire turns to, when coil 931 passes through electric current, according to not coming bright left-hand rule, this coil 931 can be stressed and mobile, reach straight-line effect, because this coil 931 can move, therefore voice coil motor must have a service cable 932, one end of this service cable 932 must be electrically connected with coil 931, to supply with coil 931 electric currents, the other end must be electrically connected on the power supply input contact on the substrate 92, when coil 931 is moving member, these service cable 932 necessary deformation thereupon, to reach the demand of continuous power supply, the many U-shaped structures with as shown of tradition voice coil motor realize this target, make for low power voice coil motor pliability flexible circuit board commonly used, yet this structure need be than the larger radius of curvature spaces, just can keep the continuous bend life-span of this service cable, this will be unfavorable for the microminiaturization of voice coil motor; In order to reach the closed loop positioning control, this device must comprise the displacement of a position transducer 94 in order to detecting voice coil motor moving part, also comprise a register control 95, in order to regulate the electric current in this voice coil motor coil 931, the relative position that makes voice coil motor moving part and fixed part is a may command, therefore, the position sensing technology of inventing miniature low price also is important problem.
Summary of the invention
When traditional voice coil motor is applied to that following problem is arranged when micro-camera is focused the driving of mirror group automatically:
(a) as mentioned above, the voice coil motor location needs position feedback transducer, optics chi, optical fiber distance measuring instrument or the Laser rangefinders of using as the contactless position feedback transducer more in the legacy equipment, but when the automatic focusing mirror group that is applied to compact camera module drives, under the restriction of space and cost, unfeasible, therefore be necessary to invent the contactless position sensing mode of a kind of small size low cost, to reach the automatic focusing mirror group driving of voice coil motor for compact camera module.
(b) traditional voice coil motor needs to be electrically connected having mercy on property of a U type service cable as mentioned above, and this cable must have suitable bending radius keeping the life-span of its continuous bend, causes very big problem for the microminiaturization of whole voice coil motor; In addition, the extra elastic force that this its curvature of having mercy on property service cable is caused, with respect to driving the micro-camera so small load of mirror group of focusing automatically, be a considerable external force source in fact, for overcoming this external force source, to increase the excessive power drain of voice coil motor, this is to be the portable apparatus of energy source with the battery, and institute is not happy sees.Therefore, when voice coil motor is applied to compact camera module, how in the finite space, to settle this service cable, make overall space and extra elastic force reduce to minimum and keep certain flex life, even improvement motor configurations, make this service cable not need Yin Mada to move and continuous modification, real is important invention problem.
But fundamental purpose of the present invention is the voice coil motor that proposes a kind of easy microminiaturization precision positioning, is applied to shortcoming and the problem that micro-camera is focused automatically and caused when the mirror group drives to improve traditional voice coil motor.
Positioning device of voice coil motor of the present invention, it is characterized by employed position feedback transducer is with the miniature low price Photo Interrupter (Photo interrupter) that produces the ON/OFF signal, the bias circuit and a source reflection plate of an invention by a tradition, reach the position feedback transducer that continuous linear voice coil motor position in certain stroke detects function, change at a low price in order to overcome voice coil motor, microminiaturized problem.This positioning device of voice coil motor comprises a voice coil motor, one position feedback transducer, with a register control, wherein this position feedback transducer is in order to the exact position of detecting voice coil motor moving member, it comprises a tradition to produce the small-sized low price Photo Interrupter of ON/OFF signal, is used to utilize its light emitting diode to produce incident light source and its photistor reception reflection source.
Certainly, wherein this position feedback transducer also comprises a source reflection plane, according to its moving direction and stroke with respect to the Photo Interrupter of above-mentioned this position transducer, can have the figure that is constituted by in vain complete or black and white color lump on it, be used to make above-mentioned incident light source, because the position change of voice coil motor moving member, and make the continuous variation of the reflection source generation light quantity after this effect, be used for detecting the position of voice coil motor moving member.
Certainly, wherein this position feedback transducer more should comprise a bias circuit, it is made of an operational amplifier and a resistance, the in-phase input end of this operational amplifier is electrically connected on a burning voltage, be used to make the collector of above-mentioned photistor and emitter bias in this burning voltage, the inverting input of this operational amplifier is electrically connected on the collector of photistor of this Photo Interrupter and an end of this resistance, and the output of this operational amplifier is electrically connected on the other end of this resistance, and the current conversion that the reflection source after being used to make above-mentioned this photistor because of the reception effect produces is a voltage signal.
Certainly, wherein this voice coil motor comprises a magnetic circuit component, and it is made of at least one group of magnet and at least one group of soft iron, is used for producing excitatory magnetic field at the air gap of magnetic loop.
Certainly, wherein this voice coil motor more should comprise a circuit block, and it is made of an at least one group of coil and a service cable, is used for flowing through suitable electric current and being placed in the air gap of above-mentioned magnetic loop at coil producing thrust with above-mentioned excitatory magnetic field effect.
Certainly, wherein the above-mentioned magnetic circuit component of this voice coil motor is that fixture and circuit block are moving member, then this service cable is that flexible circuit board by tabular whirlpool external form is constituted, and with the coil movement extensional deformation, is used to reach the outer elastic force load of minimum accommodation space and jot.
Certainly, wherein the above-mentioned magnetic circuit component of this voice coil motor is that moving member and circuit block are fixture, and then this service cable is an attached cable, does not need Yin Mada motion and deformation removes the restriction of accommodation space and the influence of extra elastic force fully.
Certainly, wherein this register control receives the position command signal subtraction of the above-mentioned voltage signal that is produced by bias circuit and this register control inner setting and obtains a position error signal, this position error signal is via ratio, differential, integral operation, pass through power amplifier, make the coil midstream of above-mentioned this voice coil motor cross a suitable electric current, the power that this electric current produced can make above-mentioned this position error signal become in zero, and the magnetic circuit component of voice coil motor and the relative position of circuit block can precision be controlled.
In sum, disclosed positioning device of voice coil motor by the technological means of following invention, is reached the demand of easy microminiaturization and low priceization, makes positioning device of voice coil motor can be successfully applied to the micro-camera mirror group driving of focusing automatically:
(a) with coil as moving member, and utilize the flexible circuit board of the tabular whirlpool external form invented to constitute its service cable, make its accommodation space and extra elastic force for minimum.
(b) with coil as fixture, making service cable is attached cable, eliminates the restriction of accommodation space and the influence of extra elastic force fully.
(c) position feedback transducer adopts the Photo Interrupter of miniature low price, the bias circuit and the source reflection plate that cooperate an invention, reach the interior continuous linear voice coil motor position of certain stroke and detect function, break through the key issue of the microminiaturized and low priceization of positioning device of voice coil motor.
Description of drawings
Fig. 1 a: moving coil formula voice coil motor structure of apparatus of the present invention and the service cable configuration schematic diagram when service cable does not have stretching, extension.
Fig. 1 b: moving coil formula voice coil motor structure of apparatus of the present invention and the configuration schematic diagram of service cable when the service cable full extension.
Fig. 2: the fixed coil formula voice coil motor mechanism and the service cable configuration schematic diagram of apparatus of the present invention.
Fig. 3: the vertical movement formula source reflection plane and the position feedback transducer configuration schematic diagram of apparatus of the present invention.
Fig. 4: the parallel motion formula source reflection plane and the position feedback transducer configuration schematic diagram of apparatus of the present invention.
Fig. 5: the Photo Interrupter of the position feedback transducer of apparatus of the present invention and bias circuit arrangement plan.
Fig. 6: the positioning control system functional block diagram of apparatus of the present invention.
Fig. 7: apparatus of the present invention adopt moving coil formula voice coil motor to be applied to the micro-camera most preferred embodiment structural drawing that the mirror group drives of focusing automatically.
Fig. 8: apparatus of the present invention adopt fixed coil formula voice coil motor to be applied to the micro-camera most preferred embodiment structural drawing that the mirror group drives of focusing automatically.
Fig. 9: traditional voice coil motor structural representation.
Embodiment
Now, consult accompanying drawing by following detailed description and obtain preferable understanding at each technology contents details of the present invention:
Voice coil motor such as coil among the present invention are removable, one preferably, as shown in Figure 1a, its fixture is made of soft iron 11 and magnet 12, and be fixed on the pedestal 15, its moving member is that coil 13 is formed with the service cable that flexible circuit board constituted 14 of the tabular whirlpool external form of being invented, when coil 13 at one end during rest point, this service cable 14 is kept former dull and stereotyped shape, when coil 13 stressed when another rest point direction moves because of flowing through electric current, shown in Fig. 1 b, because an end of this service cable 14 is electrically connected on coil 13, the other end is electrically connected on pedestal 15, the deformation 16 that therefore can produce spring-like, when being applied to micro-camera and focusing the short stroke that the mirror group drives automatically, it can extremely reach the into deformation of unlimited equivalent bending radius in the finite space, therefore in the continuous bend life-span that can guarantee this service cable 14, the extra elastic force that is caused simultaneously is very little.
Voice coil motor among the present invention is as minimum because of power demand and desire to reach when not having the influencing of service cable space and extra elastic force, one preferably, as shown in Figure 2, its moving member is made of soft iron 21 and magnet 22, its fixture is made up of coil 23 and fixing service cable 25, and be fixed on a pedestal 24, therefore it must be subjected to a magnetic force when the coil midstream excess current, because coil 23 is for fixing, this moving member will move along arrow direction 26 because of the reacting force that is subjected to this magnetic force, and the voice coil motor configuration can remove the restriction of accommodation space and the influence of extra elastic force fully thus.
Position feedback transducer among the present invention adopts a tradition in order to produce the small-sized low price Photo Interrupter of ON/OFF signal, utilize its light emitting diode to produce incident light source and its photistor reception reflection source, for reflection source can be changed with the displacement of motor moving member, one source reflection plane must be set, direction of relative movement according to this source reflection plane and Photo Interrupter, two kinds of implementation methods are arranged: first method, as Fig. 3, when the transmitting-receiving optical plane of the moving direction 32 on source reflection plane 31 and Photo Interrupter 33 is vertical, the reflecting surface on source reflection plane 31 only is required to be pure white light complexion piece 34, through experiment measuring, when having one to stablize bias voltage between the collector of photistor and emitter, then the distance on 31 on the logarithm value of the collector current of photistor and Photo Interrupter 33 and source reflection plane can reach in illuminance and be linear decrease in the stroke, so can utilize collector current to calculate distance between Photo Interrupter 33 and the source reflection plane 31.Second method, as Fig. 4, when the moving direction 42 on source reflection plane 41 is parallel with the transmitting-receiving optical plane of Photo Interrupter 43, the reflecting surface on source reflection plane 41 is necessary for the combination color lump 44 of black and white, through experimental measurement, when having one to stablize bias voltage between the collector of photistor and emitter, then the distance of the collector current value of photistor and Photo Interrupter center line and source reflection plane black and white color lump cut-off rule is linear increment certain friendship in the overtaking journey, so can utilize collector current to calculate distance between Photo Interrupter center line and the source reflection plane black and white color lump cut-off rule.Therefore, by Photo Interrupter and source reflection plane being installed in the fixture and the moving member of voice coil motor respectively, can measuring the relative movement distance of the fixture of voice coil motor and moving member and reach the effect of position feedback.
From the above mentioned, utilizing Photo Interrupter to carry out linear position measures, must be with the collector of photistor and emitter bias in a burning voltage, this linear result is just arranged, the present invention proposes a kind of bias circuit of operational amplifier that uses can reach this effect, as shown in Figure 5, the light emitting diode 511 of this Photo Interrupter is electrically connected on first voltage source 513 via a resistance 512, to produce a light source, this bias circuit also comprises an operational amplifier 52, its in-phase input end directly is electrically connected on one second voltage source 521, and its inverting input directly is electrically connected on the collector of this photistor 53, utilize the imaginary short principle of operational amplifier 52, the current potential of the collector of this photistor 53 will equate with the current potential of stablizing second voltage source 521 that in-phase input end was electrically connected of operational amplifier 52, thereby reach the effect of stablizing bias voltage; This moment, the collector of this photistor can flow into a collector current because of receiving reflection source, the present invention utilizes a resistance 54 that is electrically connected between the output of the inverting input of operational amplifier 52 and operational amplifier 52, this current conversion is become voltage signal 55, because this voltage signal is exported by operational amplifier 52, so can reduce the influence of next stage circuit load effect.
Register control among the present invention, see also shown in Figure 6, this register control receives the position feedback voltage signal 61 from above-mentioned bias circuit, and with position command voltage signal 62 through subtracter 63 subtract each other and a position error signal, this position error signal is simultaneously via a scale operation module 64, one integral operation module 65, one differentiate module 66 produces three signals, this three signal adds up the resultant current command signal via a totalizer 67, this current command signal is controlled a power amplifier 68 makes this power amplifier 68 export a Control current 69 to the voice coil motor coil, this Control current can produce the moving part that a magnetic force moves voice coil motor, above-mentioned position error signal is become into reach the purpose of positioning control in zero; For how designing scale operation module 64, the integral operation module 65 in this register control and the module 66 of differentiating, be described in detail in many control theory books.
Usually be applied to micro-camera according to the present invention and focus the mirror group automatically when driving, two kinds of most preferred embodiments are arranged:
When the coil of voice coil motor is a moving member, its best positioning device of voice coil motor, comprise a device outer cover, one mirror group is installed and is moved seat, one voice coil motor, one position feedback transducer, an and register control, as shown in Figure 7, this voice coil motor comprises a moving coil 711, be fixed on the mirror group one side that moves seat 72 is installed, and be electrically connected on one and be arranged on the mirror group and install move seat 72 another sides by tabular scroll service cable 712 that flexible circuit board constituted, this voice coil motor also comprises a magnetic circuit component of being made up of magnet 713 and soft iron 714, it is fixed on the internal ring portion of device outer cover 73, and this moving coil 711 is just put in its formed magnetic air gap 715, this position feedback transducer comprises a Photo Interrupter 741, be fixed on a printed circuit board (PCB) 742, and be entrenched in the bottom of device outer cover 73, one source reflection plate 743 is fixed on the mirror group mobile seat 72 one sides towards this Photo Interrupter 741 is installed, and one bias circuit 751 be arranged in the device outer cover 73 circuit external modules 75, this register control 752 can be made of discrete component or integrated circuit, and it is also contained in this circuit module 75.
When the coil of voice coil motor is a fixture, its best positioning device of voice coil motor, comprise a device outer cover, one mirror group is installed and is moved seat, one voice coil motor, one position feedback transducer, an and register control, as shown in Figure 8, this voice coil motor comprises a fixed coil 811, be fixed on the internal ring portion of device outer cover 82, and be electrically connected on a fixing service cable 812, this voice coil motor also comprises a magnetic circuit component of being made up of magnet 813 and soft iron 814, it is fixed on the mirror group one side that moves seat 83 is installed, and make this fixed coil 811 just place its formed magnetic air gap 815, this position feedback transducer comprises a Photo Interrupter 841, be fixed on a printed circuit board (PCB) 842, and be entrenched in the bottom of device outer cover 82, one source reflection plate 843 is fixed on the mirror group mobile seat 83 one sides towards this Photo Interrupter 841 is installed, and one bias circuit 851 be arranged in the device outer cover 82 circuit external modules 85, this register control 852 can be made of discrete component or integrated circuit, and it is also contained in this circuit module 85.
Those skilled in the art can make suitable substitutions and modifications to the present invention, yet all do not break away from the scope of claim definition of the present invention.
Claims (7)
1. positioning device of voice coil motor, it comprises:
One voice coil motor is in order to produce the thrust moving load;
One position feedback transducer, the actual displacement amount in order to the detecting voice coil motor comprises:
One Photo Interrupter is used to utilize its light emitting diode to produce incident light source and photistor receives reflection source;
One source reflection plane, it is set to the transmitting-receiving optical plane of reflecting surface towards this Photo Interrupter, is used to make above-mentioned incident light source, because the position change of voice coil motor moving member, and make the continuous variation of the reflection source generation light quantity after this effect, be used for detecting the position of voice coil motor moving member;
One bias circuit, the current conversion that the reflection source after being used to make above-mentioned this photistor because of the reception effect produces is a voltage signal,
Wherein this bias circuit comprises:
One operational amplifier, its in-phase input end directly is electrically connected on a steady voltage source, and its inverting input directly is electrically connected on the collector of above-mentioned this photistor, it is characterized by the imaginary short principle of utilizing operational amplifier, the collector potential of this photistor is equated with the burning voltage source electric potential that in-phase input end was electrically connected of operational amplifier, can stablize bias voltage and make between the collector of this photistor and emitter;
One resistance, the one end is electrically connected on the inverting input of this operational amplifier, and the other end is electrically connected on the output of this operational amplifier, and the current conversion that is used for flowing through this photistor collector becomes voltage signal;
One register control, the position quantity of detecting according to position feedback transducer and the difference of command position amount are carried out the adjustment of voice coil motor power this difference are become in zero.
2. positioning device of voice coil motor as claimed in claim 1, wherein this voice coil motor comprises:
One magnetic circuit component, it is to be made of at least one group of magnet and at least one group of soft iron institute storehouse that is made of magnetic, it is characterized by in the magnetic loop that this storehouse forms to have an air gap to produce excitatory magnetic field;
One circuit block, it is to be electrically connected a service cable by at least one group of coil to be constituted, and is used for this coil midstream and crosses suitable electric current and this coil is placed the air gap of above-mentioned magnetic loop and above-mentioned excitatory magnetic field effect produce thrust.
3. positioning device of voice coil motor as claimed in claim 2, wherein the above-mentioned magnetic circuit component of this voice coil motor is that fixture and circuit block are moving member, then this service cable is that flexible circuit board by tabular whirlpool external form is constituted, with the coil movement extensional deformation.
4. positioning device of voice coil motor as claimed in claim 2, wherein the above-mentioned magnetic circuit component of this voice coil motor is that moving member and circuit block are fixture, then this service cable is an attached cable, does not need the Yin Mada motion and deformation.
5. positioning device of voice coil motor as claimed in claim 1, this source reflection plane wherein, when the transmitting-receiving optical plane of the moving direction on source reflection plane and Photo Interrupter was vertical, the reflecting surface on source reflection plane was pure white light complexion piece.
6. positioning device of voice coil motor as claimed in claim 1, this source reflection plane wherein, when the moving direction on source reflection plane was parallel with the transmitting-receiving optical plane of Photo Interrupter, the reflecting surface on source reflection plane was necessary for the adjacent combination color lump of black and white.
7. positioning device of voice coil motor as claimed in claim 1, this register control wherein, receive the above-mentioned position error signal that gets by the voltage signal of bias circuit generation and with the position command signal subtraction of this register control inner setting, this position error signal is via ratio, differential, integral operation, pass through power amplifier, make the coil midstream of above-mentioned this voice coil motor cross a suitable electric current, the power that this electric current produced can make above-mentioned this position error signal become in zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100808804A CN100454132C (en) | 2004-10-11 | 2004-10-11 | Positioning device of voice coil motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100808804A CN100454132C (en) | 2004-10-11 | 2004-10-11 | Positioning device of voice coil motor |
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| CN1760749A CN1760749A (en) | 2006-04-19 |
| CN100454132C true CN100454132C (en) | 2009-01-21 |
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| CNB2004100808804A Expired - Fee Related CN100454132C (en) | 2004-10-11 | 2004-10-11 | Positioning device of voice coil motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI741529B (en) * | 2020-03-17 | 2021-10-01 | 致新科技股份有限公司 | Measurement apparatus for camera module |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354467B (en) * | 2007-07-27 | 2013-01-16 | 华宏新技股份有限公司 | Voice coil motor positioning apparatus |
| CN101621230B (en) * | 2008-07-01 | 2012-01-25 | 鸿富锦精密工业（深圳）有限公司 | Voice coil motor assembling jig |
| CN101930150B (en) * | 2009-06-18 | 2012-01-04 | 三洋电机株式会社 | Focus control circuit |
| KR101093372B1 (en) * | 2009-07-15 | 2011-12-14 | 산요 세미컨덕터 컴퍼니 리미티드 | Focus control circuit |
| CN102006419B (en) * | 2010-09-17 | 2013-01-02 | 惠州Tcl移动通信有限公司 | Mobile terminal with automatic focusing driving circuit and driving circuit thereof |
| CN112651382B (en) * | 2021-01-15 | 2024-04-02 | 北京中科虹霸科技有限公司 | Focusing data calibration system and iris image acquisition system |
| CN115903453B (en) * | 2022-09-30 | 2024-04-09 | 荣耀终端有限公司 | Motor control method, control system and electronic equipment |
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| US6006041A (en) * | 1997-03-12 | 1999-12-21 | Canon Kabushiki Kaisha | Display device |
| US5978600A (en) * | 1997-09-30 | 1999-11-02 | Nikon Corporation | Motion compensation device to compensate for motion of an optical system without using motion sensors |
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| CN1760749A (en) | 2006-04-19 |
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