CN102403867B - Voice coil motor - Google Patents
Voice coil motor Download PDFInfo
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- CN102403867B CN102403867B CN201010277013.5A CN201010277013A CN102403867B CN 102403867 B CN102403867 B CN 102403867B CN 201010277013 A CN201010277013 A CN 201010277013A CN 102403867 B CN102403867 B CN 102403867B
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Abstract
The invention relates to a voice coil motor, which comprises a movable magnetic circuit component, a fixed circuit component, a position feedback transducer and a controller, wherein the movable magnetic circuit component is provided with a permanent magnet and is in rigid connection with a load installing sliding seat, the fixed circuit component is mainly formed by coils, the position feedback transducer can detect the position of the movable magnetic circuit component and outputs position electrical value through a signal amplifier, and the controller comprises a storage medium and a controller. When the controller reads out yield value and offset compensation value from the storage medium and enables the group coils of the fixed circuit component to obtain electric power according to the position electrical value which is obtained after the yield value and the offset compensation value are corrected, the load installing sliding seat is enabled to move between an upper endpoint and a lower endpoint within a movable range under the mutual action of magnetic force supplied by the fixed circuit component and the movable magnetic circuit component. The voice coil motor can be controlled more precisely, users no longer need to perform correction one by one through complex detection and calculation by themselves, and initialization can be quickly finished.
Description
Technical field
The present invention is about a kind of voice coil motor, espespecially the measuring and application method of dispatching from the factory of voice coil motor.
Background technology
For the head arm of lens group or hard disk being done accurate positioning control, usually all can adopt voice coil motor (Voice Coil Motor, VCM) to come the head arm of moving lens group or hard disk.The mechanism of voice coil motor is mainly that coil is placed in the magnetic circuit that contains permanent magnet.
In optical system, when electric current will produce interactive propelling power according to Fleming's left-hand rule with the magnetic field that permanent magnet consists of during by coil, make the bearing of the permanent magnet that is rigidly connected be moved, drive simultaneously the lens group that is fixed on bearing, and reach the purpose of optical zoom, focusing.Due to, the movement of bearing is to be controlled by the electric current that flows through coil, so voice coil motor can be accomplished very accurate control.
In general, grasp movable magnetic circuit component residing position in order accurately to control voice coil motor, must to know, and must detect with Hall element.
In simple terms, in known voice coil motor application and test macro, mainly formed by data operation platform 10, one voice coil motor 11, one voice coil motors control IC12 and a Hall element 13 as shown in Figure 1.Voice coil motor is controlled IC12 and Hall element 13 is to be integrated in voice coil motor 11.The formed magnetic field intensity of magnet on the movable member of Hall element 13 detecting voice coil motors 11, and along with the movable member position not simultaneously, Hall element 13 can detect different magnetic field intensitys, and the outgoing position electrical value, to detect the position of movable member.
Yet, when a large amount of production, may provide the magnet with identical characteristic hardly, and the absolute consistency of the relative position of most spare parts having of voice coil motor 11 after fitting together, this causes individual tones coil motor 11 all to have slightly not identical control characteristic.That is to say, during in same position, the magnetic field intensity that Hall element 13 detects is also inconsistent when the movable member of different voice coil motors 11.
Magnet strength in voice coil motor 11 is smaller, or the Gap-Ratios between this magnet and Hall element 13 is larger, and this signal that all Hall element 13 is detected is less than theoretical value.Magnet strength in voice coil motor 11 is larger, or the gap between this magnet and Hall element 13 is smaller, and this signal that all Hall element 13 is detected is larger than theoretical value.
For this reason, voice coil motor is controlled IC12 and is usually understood the additional designs compensation mechanism, and adjustable signal amplifier yield value and offset compensation value namely are provided, and allows other voice coil motor 11 have the controllability of model identical.If the signal that Hall element 13 detects than theoretical value more hour, just tunes up the signal amplifier yield value after Hall element 13, and compensates this variation.When if the signal that Hall element 13 detects is larger than theoretical value, just turns Hall element 13 signal amplifier yield value afterwards down, and compensate this variation.
Yet about the utilization of signal amplifier yield value and offset compensation value, known technology has two kinds of embodiments and its shortcoming is arranged respectively.First kind of way extracts the most moderate amplifier gain value and offset compensation value with the voice coil motor of a batch, and tests whole voice coil motor of volume production with this amplifier gain value and the worthwhile standard value of offset compensation.But when the variation of voice coil motor volume production became large, defective products can increase, and makes production yields step-down.The second way one by one for the voice coil motor of producing, extracts the most moderate amplifier gain value and offset compensation value, and tests the individual tones coil motor with this amplifier gain value and offset compensation value.This mode can increase the volume production yields of voice coil motor, but because the setting value of individual tones coil motor does not have consistent, the user that this expression is follow-up, as camera module factory, mobile phone vendor and cellie, all need take time in use extracts the most moderate amplifier gain value and offset compensation value, and extra time cost is arranged.
Summary of the invention
The user must extract the most moderate amplifier gain value and offset compensation value for different voice coil motors one by one traditionally, and causes testing cost can not to be in any more, and the initialization time when using simultaneously is also excessively of a specified duration.For this reason, fundamental purpose of the present invention is providing a kind of voice coil motor, and its main special medium that arranges stores yield value and the offset compensation value (complete in advance and test and store) of signal amplifier at least.So, after controller is read yield value and offset compensation value from medium, can proofread and correct signal amplifier according to yield value and offset compensation value, make the position electrical value of signal amplifier output have ultimate resolution, and can control more accurately voice coil motor, but the user but no longer needs to pass through voluntarily complicated detecting and calculation calibration one by one, also can complete rapidly initialization.
Based on above-mentioned purpose, voice coil motor of the present invention comprises movable magnetic circuit component, permanent circuit parts, position feedback transducer, medium and controller.This wherein, medium can be integrated in controller.Movable magnetic circuit component has permanent magnet and rigid connecting is connected to load installation slide.The permanent circuit parts mainly are made of coil.Position feedback transducer can be detected movable magnetic circuit component position, and via signal amplifier outgoing position electrical value.Medium stores a yield value and an offset compensation value of this signal amplifier at least.when controller is read yield value and offset compensation value from medium, and the position electrical value after proofreading and correct according to yield value and offset compensation value, after making the group coil acquisition electric power of permanent circuit parts, under the magnetic force that permanent circuit parts and movable magnetic circuit component provide interacts, according to total travel distance and the proportionate relationship that can order between the electrical value scope, make load install slide in mobile range upper extreme point and lower extreme point between move, wherein, this total travel distance be this movable magnetic circuit component in this voice coil motor this upper extreme point and the removable ultimate range between this lower extreme point, this can order the electrical value scope to refer to this movable magnetic circuit component absolute value between other this position electrical value when this upper extreme point and this lower extreme point.
Above-mentioned voice coil motor wherein, utilizes this stored yield value of this medium and this offset compensation value to proofread and correct this signal amplifier, and this position electrical value that this signal amplifier is exported has ultimate resolution.
Above-mentioned voice coil motor, wherein, this position electrical value after proofreading and correct according to this yield value and this offset compensation value, this controller takes orders, and during mobile this movable magnetic circuit component, when it can take orders the maximum mobile step number of tool, this position electrical value tool ultimate resolution that this signal amplifier is exported.
Above-mentioned voice coil motor, wherein, when this movable magnetic circuit component absolute value between other this position electrical value when this upper extreme point and this lower extreme point is maximum, this position electrical value tool ultimate resolution that this signal amplifier is exported.
Above-mentioned voice coil motor, wherein, but this signal amplifier is a maximum working position electrical value when its peak work capacity, but this movable magnetic circuit component effective this position electrical value when this upper extreme point is 70% to 100% of this maximum working position electrical value, but this movable magnetic circuit component effective this position electrical value when this lower extreme point is 0% to 30% of this maximum working position electrical value.
Above-mentioned voice coil motor, wherein, but this position electrical value of this movable magnetic circuit component effective the best when this upper extreme point is 90% to 100% of this maximum working position electrical value, but this position electrical value of this movable magnetic circuit component effective the best when this lower extreme point is 0% to 10% of this maximum working position electrical value.
Above-mentioned voice coil motor, wherein, this total travel distance and this can order the proportionate relationship between the electrical value scope to equal the displacement of this movable magnetic circuit component when the per unit electrical value.
Above-mentioned voice coil motor, wherein, this medium is integrated in this controller.
Above-mentioned voice coil motor, wherein, this position feedback transducer is integrated in this controller.
Beneficial effect of the present invention is: the special medium that arranges stores yield value and the offset compensation value (complete in advance and test and store) of signal amplifier at least.So, after controller is read yield value and offset compensation value from medium, can proofread and correct signal amplifier according to yield value and offset compensation value, make the position electrical value of signal amplifier output have ultimate resolution, and can control more accurately voice coil motor, and the user no longer needs to pass through voluntarily complicated detecting and calculation calibration one by one, also can complete rapidly initialization.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the schematic diagram of known voice coil motor;
Fig. 2 A～2B is the schematic diagram of voice coil motor of the present invention;
Fig. 3 A～3B is the schematic diagram of the table of comparisons of the present invention.
Wherein, Reference numeral
10 data operation platforms
11 voice coil motors
12 voice coil motors are controlled IC
13 Hall elements
40 data operation platforms
41 voice coil motors
42 controllers
420 position feedback transducers
421 mediums
43 movable magnetic circuit component
44 permanent circuit parts
Embodiment
Below in conjunction with the drawings and specific embodiments, technical solution of the present invention being described in detail, further understanding purpose of the present invention, scheme and effect, but is not the restriction as claims protection domain of the present invention.
See also Fig. 2 A～2B, Fig. 2 A～2B is the schematic diagram of voice coil motor of the present invention.As shown in Fig. 2 A～2B, in the invention process case, voice coil motor 41 of the present invention comprises movable magnetic circuit component 43, permanent circuit parts 44, position feedback transducer 420, medium 421 and controller 42.This wherein, medium 421 (generally adopting non-volatility memorizer) can be integrated in controller 42.Movable magnetic circuit component 43 has permanent magnet and rigid connecting is connected to load installation slide (not describing).Permanent circuit parts 44 mainly are made of coil.Position feedback transducer 420 can be detected movable magnetic circuit component 43 positions, and via signal amplifier (not describing) outgoing position electrical value.What must pay special attention to is, but the position electrical value of signal amplifier when its peak work capacity is defined by maximum working position electrical value.
In simple terms, the medium 421 in voice coil motor 41 of the present invention stores yield value and the offset compensation value of signal amplifier at least.So, after controller 42 is read yield value and offset compensation value from medium 421, can proofread and correct signal amplifier according to yield value and offset compensation value, make the position electrical value of signal amplifier output have ultimate resolution (can be described in more detail what is meant by ultimate resolution after a while), and can control more accurately voice coil motor 41, but the user but no longer needs voluntarily by complicated detecting and calculation calibration one by one (being mainly the work of data operation platform 40).In other words, position electrical value after controller 42 is proofreaied and correct according to yield value and offset compensation value, after making the group coil acquisition electric power of permanent circuit parts 44, under the magnetic force that permanent circuit parts 44 and movable magnetic circuit component 43 provide interacts, make the load of movable magnetic circuit component 43 that slide is installed and accurately move between the upper extreme point in mobile range and lower extreme point.When if load installation slide carries camera lens, above-mentioned means can reach optical zoom or focusing purpose.
The yield value of the signal amplifier that medium 421 is stored and offset compensation value are to utilize data operation platform 40 to pick out from majority group numerical value with intelligent screening mechanism, and the requirement in describing under must meeting.Yield value and offset compensation value that medium 421 stores signal amplifier at least can allow the position electrical value that signal amplifier is exported have ultimate resolution.That is to say, position electrical value after proofreading and correct according to yield value and offset compensation value, when controller is assigned movement directive to movable magnetic circuit component 43, when it can issue an order the maximum mobile step number of tool, claim the position electrical value tool ultimate resolution that signal amplifier is exported.Or, movable magnetic circuit component 43 upper extreme point during with lower extreme point the absolute value between individual other position electrical value be relative when large, the larger resolution of position electrical value tool that signal amplifier is exported.
See also Fig. 3 A～3B, Fig. 3 A～3B is the schematic diagram of the table of comparisons of the present invention.In order to obtain appropriate yield value and offset compensation value and to be stored to medium 421, the present invention utilizes intelligent screening mechanism, and select from the array numerical value as shown in Fig. 3 A～3B (being yield value and offset compensation value).
In screening, data operation platform 40 is temporarily picked out one group of numerical value from array numerical value, the temporary storage that setting controller 42 is corresponding, and organize the temporary transient correction signal amplifier of numerical value with this, then after movable magnetic circuit component 43 being moved to respectively upper extreme point and lower extreme point, when if the movable position electrical value of magnetic circuit component 43 when upper extreme point and lower extreme point is the active position electrical value of upper extreme point and lower extreme point, the temporary storage setting value of previous temporary transient this group numerical value of selecting namely is stored to medium 421, and completes test job of the present invention.What must pay special attention to is, position feedback transducer 420 is during via signal amplifier outgoing position electrical value, be 0 to 511 in case exportable position electrical value under the ability to work of signal amplifier own, but be not in fact to obtain so little and large output, after only utilizing yield value and offset compensation value to proofread and correct, make its output can meet or press close to this minimum and greatest measure as far as possible.
For instance, initial value in case the yield value temporary storage is 0, by as shown in Figure 3A the table of comparisons as can be known the signal amplifier yield value be 10 times, data operation platform 40 obtains the position electrical value of movable magnetic circuit component 43 when upper extreme point and the lower extreme point with this and is respectively 100 and 200, and the absolute value between the position electrical value of upper extreme point and lower extreme point is 100 (200-100) so.In order to measure yield value, the hypothetical target value is 306 (511X60%), the signal amplifier yield value should increase 3.06 times more so, and by as shown in Figure 3A the table of comparisons as can be known appropriate signal amplifier yield value be 35 times, that is the yield value temporary storage should be set as 5.In addition, initial value in case the offset compensation temporary storage is 7, by the table of comparisons as shown in Fig. 3 B as can be known the offset compensation value be 0, and obtain the position electrical value of movable magnetic circuit component 43 when upper extreme point and the lower extreme point with this and be respectively 100 and 200, the intermediate value between the position electrical value of upper extreme point and lower extreme point is 150 ((100+200)/2) so.In order to measure the offset compensation value, the hypothetical target value is 256 (511/2), so just lacked 106 than desired value 256, and by the table of comparisons as shown in Fig. 3 B as can be known appropriate offset compensation value be 100, that is the offset compensation temporary storage should be set as 12.So, after the yield value and offset compensation value of finding out according to aforesaid way, movable magnetic circuit component 43 individual other position electrical value when upper extreme point and lower extreme point can be referred to as the active position electrical value.
Anyway, according to thumb rule, but the movable active position electrical value of magnetic circuit component 43 when upper extreme point is 70% to 100% of the own maximum of signal amplifier working position electrical value, but and the movable active position electrical value of magnetic circuit component 43 when lower extreme point is 0% to 30% of maximum working position electrical value.For instance, 511 (in other words but the maximum working position electrical value of signal amplifier is, exportable position electrical value is 0 to 511) time, the movable active position electrical value of magnetic circuit component 43 when upper extreme point is 357.7～511, and the movable active position electrical value of magnetic circuit component 43 when lower extreme point is 0～153.3.In above-mentioned scope, but the position electrical value of movable magnetic circuit component 43 effective the best when upper extreme point is 90% to 100% of maximum working position electrical value, but and the position electrical value of movable magnetic circuit component effective the best when lower extreme point is 0% to 10% of maximum working position electrical value.
In order to improve the step pitch absolute precision of voice coil motor 41, but medium 421 also additional storage the total travel distance is arranged so that the displacement of this movable magnetic circuit component 43 when allowing the user calculate voluntarily or to allow controller 42 dynamically calculate the per unit electrical value.The total travel of above-mentioned movable magnetic circuit component 43 distance be the movable magnetic circuit component 43 that measured by external means (for example distance measuring instrument) in voice coil motor 41 upper extreme point and the removable ultimate range between lower extreme point.
Can order the electrical value scope in order to obtain, data operation platform 40 first makes movable magnetic circuit component 43 move to upper extreme point and lower extreme point, and movable magnetic circuit component 43 absolute value between other position electrical value when upper extreme point and the lower extreme point is defined as can orders the electrical value scope.So, data operation platform 40 is read this total travel distance from medium 421, and according to total travel distance and can order proportionate relationship between the electrical value scope, allows movable magnetic circuit component 43 move relative distance.For instance, total travel distance and can order proportionate relationship between the electrical value scope to be 0.3mm/200 unit the time, every 100 units make movable magnetic circuit component 43 move 0.15mm.
Utilize the above detailed description of preferred embodiments, be to wish more to know to describe feature of the present invention and spirit, and with above-mentioned disclosed preferred embodiment, category of the present invention limited.On the contrary, its objective is that hope can contain in the category of the scope of the claims of being arranged in of various changes and tool equality institute of the present invention wish application.
Claims (9)
1. a voice coil motor, is characterized in that, comprises:
One movable magnetic circuit component has permanent magnet and rigid connecting and is connected to a load installation slide;
One permanent circuit parts mainly are made of coil;
One position feedback transducer is detected this movable magnetic circuit component position, and via signal amplifier output one a position electrical value;
One medium, this medium store a yield value and an offset compensation value of this signal amplifier at least;
One controller, this controller is read this yield value and this offset compensation value from this medium, and this position electrical value after proofreading and correct according to this yield value and this offset compensation value, after making the group coil acquisition electric power of these permanent circuit parts, under the magnetic force that these permanent circuit parts and movable magnetic circuit component provide interacts, according to a total travel distance and the proportionate relationship that can order between the electrical value scope, make this load install slide in mobile range a upper extreme point and a lower extreme point between move;
Wherein, this total travel distance be this movable magnetic circuit component in this voice coil motor this upper extreme point and the removable ultimate range between this lower extreme point;
Wherein, this can order the electrical value scope to refer to this movable magnetic circuit component absolute value between other this position electrical value when this upper extreme point and this lower extreme point.
2. voice coil motor as claimed in claim 1, is characterized in that, utilizes this stored yield value of this medium and this offset compensation value to proofread and correct this signal amplifier, and this position electrical value that this signal amplifier is exported has ultimate resolution.
3. voice coil motor as claimed in claim 2, it is characterized in that, this position electrical value after proofreading and correct according to this yield value and this offset compensation value, this controller takes orders, and during mobile this movable magnetic circuit component, when it can take orders the maximum mobile step number of tool, this position electrical value tool ultimate resolution that this signal amplifier is exported.
4. voice coil motor as claimed in claim 2, it is characterized in that, when this movable magnetic circuit component absolute value between other this position electrical value when this upper extreme point and this lower extreme point is maximum, this position electrical value tool ultimate resolution that this signal amplifier is exported.
5. voice coil motor as claimed in claim 1, it is characterized in that, but this signal amplifier is a maximum working position electrical value when its peak work capacity, but this movable magnetic circuit component effective this position electrical value when this upper extreme point is 70% to 100% of this maximum working position electrical value, but this movable magnetic circuit component effective this position electrical value when this lower extreme point is 0% to 30% of this maximum working position electrical value.
6. voice coil motor as claimed in claim 5, it is characterized in that, but this position electrical value of this movable magnetic circuit component effective the best when this upper extreme point is 90% to 100% of this maximum working position electrical value, but this position electrical value of this movable magnetic circuit component effective the best when this lower extreme point is 0% to 10% of this maximum working position electrical value.
7. voice coil motor as claimed in claim 1, is characterized in that, this total travel distance and this can order the proportionate relationship between the electrical value scope to equal the displacement of this movable magnetic circuit component when the per unit electrical value.
8. voice coil motor as claimed in claim 1, is characterized in that, this medium is integrated in this controller.
9. voice coil motor as claimed in claim 1, is characterized in that, this position feedback transducer is integrated in this controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010277013.5A CN102403867B (en) | 2010-09-07 | 2010-09-07 | Voice coil motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010277013.5A CN102403867B (en) | 2010-09-07 | 2010-09-07 | Voice coil motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102403867A CN102403867A (en) | 2012-04-04 |
| CN102403867B true CN102403867B (en) | 2013-06-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010277013.5A Expired - Fee Related CN102403867B (en) | 2010-09-07 | 2010-09-07 | Voice coil motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102403867B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5257060A (en) * | 1990-10-20 | 1993-10-26 | Fuji Photo Film Co., Ltd. | Autofocus camera and a method of regulating the same |
| CN1892848A (en) * | 2005-07-01 | 2007-01-10 | 三洋电机株式会社 | Light reception output controlling apparatus of photo detector in optical pickup unit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6873148B2 (en) * | 2002-06-28 | 2005-03-29 | Canon Kabushiki Kaisha | Position detecting apparatus, and optical apparatus comprising this and position detecting method |
| JP2005304096A (en) * | 2004-04-06 | 2005-10-27 | Renesas Technology Corp | Semiconductor integrated circuit for driving motor and magnetic disc storage |
| US7936144B2 (en) * | 2008-03-06 | 2011-05-03 | Allegro Microsystems, Inc. | Self-calibration algorithms in a small motor driver IC with an integrated position sensor |
-
2010
- 2010-09-07 CN CN201010277013.5A patent/CN102403867B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5257060A (en) * | 1990-10-20 | 1993-10-26 | Fuji Photo Film Co., Ltd. | Autofocus camera and a method of regulating the same |
| CN1892848A (en) * | 2005-07-01 | 2007-01-10 | 三洋电机株式会社 | Light reception output controlling apparatus of photo detector in optical pickup unit |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2005-304096A 2005.10.27 |
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| CN102403867A (en) | 2012-04-04 |
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