CN102195438A - Method for achieving device for driving object to move in a linear mode and linear motor - Google Patents
Method for achieving device for driving object to move in a linear mode and linear motor Download PDFInfo
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- CN102195438A CN102195438A CN2011101300211A CN201110130021A CN102195438A CN 102195438 A CN102195438 A CN 102195438A CN 2011101300211 A CN2011101300211 A CN 2011101300211A CN 201110130021 A CN201110130021 A CN 201110130021A CN 102195438 A CN102195438 A CN 102195438A
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Abstract
The invention provides a method for achieving a device for driving an object to move in a linear mode and a linear motor, wherein, the linear motor (1) comprises a rotor (12) and a stator (10) for driving the rotor (12) to move along a straight line (A), wherein the rotor (12) is provided with a first friction surface (120); the linear motor (1) also comprises a pressing component (16); the stator (10) and /or the pressing component (16) are/is provided with a second friction surface (14) which is contacted with the first friction surface (120); and the pressing component (16) is used for providing mutual pressure for the first friction surface (120) and the second friction surface (14), and the pressure ensures that friction is generated between the first friction surface (120) and the second friction surface (14), so that the rotor (12) is maintained at the current location. Compared with the prior art of maintaining the rotor position through uninterruptedly applying current, in the invention, the friction is utilized for maintaining the rotor position, so that the energy consumption of the linear motion is saved.
Description
Technical field
The present invention relates to realize driving the method for the straight-line device of object, and relate to linear motor based on this method.
Background technology
Focusing is the important ring in the picture catching technology, its main purpose be with image focusing to be caught to image sensor element.In the present focusing technology, image sensor element generally is maintained fixed, and eyeglass can be moved forward and backward along its optical axis by motor driven, thereby will converge on this fixing imageing sensor with the light that certain orientation incides on the eyeglass.As seen, how to drive eyeglass, and how to keep eyeglass be the essential technical problem that solves in the focusing in the position along optical axis along the moving of optical axis.
At portable image-capturing apparatus, for example have in the mobile phone of photographic/camera function, very high to the dimensional requirement of the focusing equipment that comprises eyeglass, focusing equipment should be as much as possible little.So moving of eyeglass generally driven by small-sized voice coil motor at present.The basic principle of voice coil motor is by hot-wire coil being placed among the magnetic field, thereby produces Lorentz force action in coil, and drive coil moves then.Coil is connected with the frame fixation of eyeglass by eyeglass, and magnetic material is arranged along optical axis direction, moves along the optical axis direction straight line thereby coil can drive eyeglass.
At present, generally the structure of the focusing equipment of Shi Yonging is such: elastic construction is set the mover of voice coil motor is linked to each other with base being parallel to optical axis direction, for example use shell fragment to support or spring suspension, the elastic force that this elastic construction produces is parallel with optical axis direction.Voice coil motor drives Lens assembly and overcomes this elastic force and move along optical axis under Current Control.
Summary of the invention
As seen, the shortcoming of prior art comprises: because elastic construction itself has certain-length and flexible on the eyeglass moving direction, movably distance is shorter to cause eyeglass; And in order to make eyeglass remain on certain position, need continue to provide electric current to impose on the elastic force of Lens assembly, cause the power consumption of the equipment of focusing bigger to voice coil motor with the balance elastic construction.
At least for the purpose that solves this technical problem, the invention provides a kind of method that realizes driving the object linear motion device, and based on the linear motor of this method.
According to a first aspect of the invention, a kind of method that realizes driving the object linear motion device is provided, and this device has stator and can be driven the mover of motion along a straight line by described stator, wherein, this mover has first friction surface, and this method may further comprise the steps:
-provide and contacted second friction surface of described first friction surface;
-for described first and second friction surfaces provide mutual pressure, described pressure makes and can produce the frictional force that described mover is remained on its current location between described first and second friction surfaces;
At least one item during this method is further comprising the steps of:
-described stator drive described mover from static begin to move before, make described mover produce vibration, described vibration will drive described mover and begin the mobile stiction that need overcome from inactive state and change kinetic force of friction into;
-described stator drives described mover and moves in the mode of segmentation, and in each section, described mover begins to move from inactive state, and quickens at least and slow down, and gets back to inactive state at last, and the difference of the mobile displacement of each section is less than certain threshold value.
According to above aspect, when mover was moved to the desired position, frictional force was allowed to produce to hold it in this position, does not keep thereby do not need to be continuously applied power.And, under a kind of situation, make mover produce the vibratory drive mover and change kinetic force of friction into from beginning to move the stiction that need overcome, can reduce the driving mover like this and move required power, save the energy consumption of this device; Under the another kind of situation, each section of mover moves all from static setting in motion and gets back to inactive state, and the difference that every section moves is less than certain threshold value, and this makes it possible to more accurate and as one man controls moving of mover.
According to one preferred embodiment, described device comprises linear motor, described stator and mover comprise in magnet and the coil one and another respectively, the described vibrative step of described mover that makes comprises: the electric current that passes to variation to described coil, producing, thereby make described mover on described rectilinear direction, produce vibration to active force described mover, that change.Present embodiment realizes easier, can produce vibration with comparalive ease.
According to another preferred embodiment, the described step of pressure that provides comprises that the use elastomeric element provides this pressure.Use elastomeric element to provide the benefit of pressure to be that elastomeric element is subjected to external environment, for example the influence of variation such as humidity, temperature is less, and it is constant to make elastic force to keep substantially in the whole designed life of this device, thereby makes this method more stable.
According to a second aspect of the invention, the purposes of above method is to be used for focusing control eyeglass moving along lens light axis.The dimensional requirement of focusing mechanism is very little, and the realization of above method mainly gets final product by friction surface, and friction surface can be arranged along the eyeglass moving range, does not take more spaces, meets the little requirement of size.
Above method can more specifically be applied in the present linear motor more widely, according to a third aspect of the present invention, a kind of linear motor is provided, comprise mover and be used to drive the stator that described mover moves along rectilinear direction, it is characterized in that, described mover has first friction surface, and this motor also comprises:
-press member;
Described stator and/or described press member have and contacted second friction surface of described first friction surface;
Described press member is used to described first and second friction surfaces that mutual pressure is provided, and described pressure makes and can produce the frictional force that described mover is remained on its current location between described first and second friction surfaces.
According to above aspect, when mover is moved to the desired position, frictional force is allowed to produce to hold it in this position, with respect to existing, need be continuously applied electric current and generate to offset the power of shell fragment to keep rotor position, this aspect does not need to be continuously applied electric current, thereby has saved the energy consumption of linear motor greatly.
One preferred embodiment in, described press member comprises elastomeric element, on perpendicular at least one direction of described rectilinear direction, the contact of second friction surface that described elastomeric element is relative, first friction surface relative with described mover, and provide mutual pressure for every pair of contacted first and second friction surfaces.This preferred embodiment in, adopt the mode of clamping to produce frictional force, more stable.
One preferred embodiment in, described press member comprises elastomeric element, described elastomeric element is made by electromagnetic shielding material, with the perpendicular cross section of described rectilinear direction on surround described stator and described mover closedly, and in the moving range of described mover, extend at least along described rectilinear direction.This preferred embodiment in, electromagnetic wave shielding preferably is provided, avoid linear motor that other device is produced electromagnetic interference.
According to a fourth aspect of the present invention, provide a kind of focusing module, having comprised: eyeglass; According to the described linear motor of third aspect of the present invention, the mover of this linear motor is fixedlyed connected with described eyeglass, and the rectilinear direction that mover moves is consistent with the optical axis of described eyeglass.In aspect this, provide based on focusing module method of the present invention and linear motor, incorporate.
According to a fifth aspect of the present invention, provide a kind of picture catching module, comprised imageing sensor; The 4th the described focusing module in aspect is used for eyeglass is moved along optical axis according to the present invention, focuses to described imageing sensor with the light that will inject eyeglass.In aspect this, provide to comprise imageing sensor, incorporate picture catching module.
According to a sixth aspect of the invention, provide a kind of electronic equipment, comprised the 5th described picture catching module in aspect according to the present invention with image capture function.
Other advantage of the present invention will be described below, perhaps the explanation by hereinafter and being understood by those skilled in the art.
Description of drawings
Fig. 1 is the cross-sectional view that has according to the picture catching module of the linear motor of one aspect of the invention;
Fig. 2 is an exemplary plot that is used for driving at linear motor the drive current that the mover stepping moves.
In the accompanying drawing, same or analogous Reference numeral is represented same or analogous steps characteristic or parts (module) feature.
Embodiment
Below in conjunction with picture catching module shown in Figure 1 and drive current shown in Figure 2 the method that linear motor according to the present invention and realization drive the object linear motion device is described.
As shown in Figure 1, linear motor 1 comprises mover 12 and is used to drive the stator 10 that mover 12 moves along straight line A direction, and mover 12 has first friction surface 120, and this motor 1 also comprises:
-press member 16;
Press member 16 has and first friction surface, 120 contacted second friction surfaces 14;
Press member 16 is used to first friction surface 120 and second friction surface 14 that mutual pressure is provided, and pressure makes to win and can produce the frictional force that mover 12 is remained on its current location between the friction surface 120 and second friction surface 14.
Fig. 1 is perpendicular to the cross-sectional view of the picture catching module of straight line A direction, and straight line A is vertical with paper, and along in paper, extending with both direction outside paper.
In the time of in being applied in the focusing module, the mover 12 and the eyeglass L of this linear motor 1 are fixed together, and the straight line A direction that mover 12 moves is consistent with the optical axis of eyeglass L.When this focusing module was applied in the picture catching module, imageing sensor S was perpendicular to the optical axis of eyeglass L, be disposed aligned with eyeglass L, thereby accepted the image of eyeglass L focusing.This picture catching module can be installed in the electronic equipment with image capture function, for example in the mobile phone.
With respect to linear motor existing, that employing elastic force fixes rotor position, the linear motor of above aspect adopts frictional force to fix rotor position according to the present invention, has more following advantages:
The first, saved elastomeric element flexible on rectilinear direction, thereby on rectilinear direction, saved the space, and bigger mover moving range also is provided.Especially, in the time of in being applied in the focusing module, reduce the size of the optical axis direction of focusing module, made it thinner, and bigger eyeglass moving range can be provided, helped focusing.
The second, after mover moves the arrival target location, if mover (and the parts that have, eyeglass for example) has movement tendency, for example linear motor is rocked, and mover is maintained at the target location under the effect of the frictional force that pressure produces, and need not to continue to provide electric energy.With respect to existing, need be continuously applied electric energy and produce the linear motor that the elastic force with elastomeric element balances each other, the minimizing power consumption that linear motor provided by the invention can be to a great extent.
One preferred embodiment in, press member 16 is an elastomeric element, its applied pressure is an elastic force.The advantage of this execution mode is that elastomeric element is subjected to external environment, and for example the influence of variation such as humidity, temperature is less.Therefore, the elastic force that elastomeric element applies can be kept constant in the whole life-span of this linear motor substantially, and this has improved the stability of linear motor.
As shown in Figure 1, outer surface all has first friction surface 120 (left and right sides does not illustrate with Reference numeral) around the mover 12, first friction surfaces, 120 contacts that 16 two pairs of relative second friction surfaces 14 (a pair of of the left and right sides do not illustrate with Reference numeral) of elastomeric element are relative with 12 two pairs of movers respectively are for every pair of contacted first friction surface 120 and second friction surface 14 provide mutual pressure.This preferred embodiment in, adopt from the outside around the mode of clamping produce frictional force, more stable.Be appreciated that the present invention is not limited to this execution mode, at first, also can be singly from up and down or left and right sides clamping mover; Secondly, elastomeric element needn't necessarily relatively be provided with in pairs, can use elastomeric element in a side, and use general rigid element at opposite side.
One preferred embodiment in, as shown in Figure 1, elastomeric element 16 with the perpendicular section S of straight line A direction on surround mover 12, and each second friction surface 14 towards mover 12 indents with clamping mover 12, in the gap of stator 10 between mover 12 and elastomeric element 16.This execution mode provides a kind of compact linear motor structure.
Further preferably, elastomeric element 16 is made by electromagnetic shielding material, along straight line A direction at least in the moving range of mover 12 and/or in the stator 10 shared scopes (not shown in figure 1) extend.This preferred embodiment in, elastomeric element gets up mover and/or stator surrounding, and electromagnetic wave shielding preferably is provided, and avoids linear motor that other device is produced electromagnetic interference.
Be appreciated that, the present invention is not limited to this execution mode, and first friction surface 120 can be positioned at the inboard of mover 12, and elastomeric element 16 also can be positioned at the inside of mover 12, and second friction surface 14 in each elastomeric element 16 outside is towards mover 12 toward evaginations, with fixing mover 12.
In the above embodiment, being positioned on the press member 16 with second friction surface 14 is example, and present invention is described.Be appreciated that the present invention is not limited to this, second friction surface 14 also can be positioned on the stator 10, perhaps is present in simultaneously on press member 16 and the stator 10.
More than the structure according to linear motor of the present invention is described in detail, below this linear motor is carried out straight-line execution mode and is described.
Preferred embodiment stator 10 is used for making mover 12 produce vibration before driving mover 12 and beginning from inactive state to move according to one, and vibration drives movers 12 with stator 10 and begins to move the stiction that need overcome from inactive state and change kinetic force of friction into.
Further, principle according to linear motor, stator 10 and mover 12 comprise in magnet and the coil one and another respectively, this linear motor 1 also comprises circuit, be used for providing the electric current of variation to coil, to produce active force 10 pairs of movers 12 of stator, that change,, mover 12 vibrates thereby being produced in straight line A direction.
The principle of this technical scheme is that mover 12 generally is a non-rigid body, and vibration can make the trend of mover 12 accumulation motion, begins the mobile stiction that need overcome from inactive state and changes kinetic force of friction into thereby will drive mover 12.The advantage of this scheme is, at first, has reduced mover 12 is begun mobile required actuating force from inactive state, thereby reduced power consumption; Secondly, if at first need overcome stiction, actuating force will be bigger so, and after mover 12 begins to move, only need overcome kinetic force of friction, but this bigger actuating force can make mover 12 than difficult control still in effect, and in the present embodiment, drive mover from inactive state begin to move with begin to move after the frictional force that need overcome identical, constant actuating force just can be suitable for.It should be noted that, vibration described here comprises the situation that the position of mover moves forward and backward practically around a central point, comprise that also mover has the trend that moves forward and backward, for example be applied in the power that the changes (power that direction changes, but or the power of the constant size variation of direction) thus have mobile trend, but situation about really not moving.
According to another preferred embodiment, stator 10 driving movers 12 move in the mode of segmentation, in each section, mover 12 begins to move from inactive state, and quicken at least and slow down, get back to inactive state at last, and the difference of the mobile displacement of each section is less than certain threshold value.
Particularly, in linear motor, drive current can be for example shown in Figure 2, and it is square wave (duty ratio the is t1/t2) formation of t1 by a plurality of duration of t2 blanking time.In whole process, mover at first begins to quicken from inactive state, then slows down, and gets back to inactive state at last.Each time span of drive current is that the high level of t1 and time span afterwards are that the zero level of t2 constitutes one-period, each section that moves corresponding to mover 12 segmentations.Like this, each section of mover 12 moves all from static setting in motion and gets back to inactive state, and every section moves equally in fact, for example is 10 microns; In the reality, very difficult assurance equates that utterly general every section moves difference less than certain threshold value, and for example 5 microns get final product.This makes moving of mover can be compared accurately and control as one man, is particularly conducive under the very high application scenarios of precision, in the module of for example focusing.Will be understood that, drive current described above only is for example purposes, other are any can to make the mover segment movement, in each section, at first begin to quicken from inactive state, then slow down, get back to inactive state at last, and the essentially identical drive current of each section moving displacement all belongs to category of the present invention.
Be appreciated that, in the focusing technology, the process of whole focusing generally is such: control eyeglass straight line moves, and in moving process image definition is detected, determining to determine corresponding lens position behind the high definition place, and the control eyeglass return back to the relevant position.These steps are not that the present invention pays close attention to, and what the present invention mainly paid close attention to is the maintenance of the position of control eyeglass in the straight line moving process and mobile concrete mode.
More than be that example describes in detail this linear motor with the linear motor according to the present invention module that is used to focus, be appreciated that application of the present invention is not limited to this, occasion the present invention that other any linear motors are suitable for can both be suitable for.
Inventive concept of the present invention is not restricted to realize linear motor, but be used to realize the method for the straight-line device of any driving object, this device has stator 10 and can be driven the mover 12 of motion along a straight line by stator 10, wherein, this mover has first friction surface 120, and this method may further comprise the steps:
-provide and first friction surface, 120 contacted second friction surfaces 14;
-for described first friction surface 120 and second friction surface 14 provide mutual pressure, pressure makes to win and can produce the frictional force that mover 12 is remained on its current location between the friction surface 120 and second friction surface 14;
At least one item during this method is further comprising the steps of:
-stator 10 drive movers 12 from static begin to move before, make mover 12 produce vibration, vibration will drive mover 12 and begin the mobile stiction that need overcome from inactive state and change kinetic force of friction into;
-stator 10 drives movers 12 and moves in the mode of segmentation, and in each section, mover 12 begins to move from inactive state, and quickens at least and slow down, and gets back to inactive state at last, and the difference of the mobile displacement of each section is less than certain threshold value.
Further, device comprises linear motor 1, and stator 10 and mover 12 comprise in magnet and the coil one and another respectively, and the described mover 12 vibrative steps that make comprise:
-pass to the electric current of variation to described coil, producing, thereby make mover 12 on rectilinear direction, produce vibration to active force mover 12, that change.
Further, the described step of pressure that provides comprises that use elastomeric element 16 provides this pressure.
Further, the described step of described second friction surface 14 that provides comprises:
-second friction surface 14 is provided on stator 10; And/or
-second friction surface 14 is provided on elastomeric element 16.
In an example, the purposes of this method is to be used for focusing control eyeglass moving along lens light axis.
Although sets forth in detail and described the present invention in accompanying drawing and aforesaid description should think that this is illustrated and describes is illustrative and exemplary, rather than restrictive; The invention is not restricted to above-mentioned execution mode.
The those skilled in the art in those present technique fields can be by research specification, disclosed content and accompanying drawing and appending claims, and understanding and enforcement are to other changes of the execution mode of disclosure.In practical application of the present invention, the function of a plurality of technical characterictics that part is quoted in may enforcement of rights requiring, for example press member 16 can be passed through same parts with stator 10, and for example one has the magnet that has covered elastomeric material and realizes.In the claims, word " comprises " element and the step of not getting rid of other, and wording " one " is not got rid of plural number.Any Reference numeral in the claim should not be construed as the restriction to scope.
Claims (16)
1. method that realizes driving the object linear motion device, this device has stator (10) and can be driven along a straight line the mover (12) of (A) motion by described stator (10), wherein, this mover has first friction surface (120), and this method may further comprise the steps:
-provide and contacted second friction surface of described first friction surface (120) (14);
-providing mutual pressure for described first and second friction surfaces (120,14), described pressure makes and can produce the frictional force that described mover (12) is remained on its current location between described first and second friction surfaces (120,14);
At least one item during this method is further comprising the steps of:
-described stator (10) drive described mover (12) from static begin to move before, make described mover (12) produce vibration, described vibration will drive described mover (12) and begin the mobile stiction that need overcome from inactive state and change kinetic force of friction into;
-described stator (10) drives described mover (12) and moves in the mode of segmentation, in each section, described mover (12) begins to move from inactive state, and quickens at least and slow down, get back to inactive state at last, and the difference of the mobile displacement of each section is less than certain threshold value.
2. method according to claim 1, it is characterized in that, described device comprises linear motor (1), and described stator (10) and mover (12) comprise in magnet and the coil one and another respectively, and the described vibrative step of described mover (12) that makes comprises;
-pass to the electric current of variation to described coil, producing, thereby make described mover (12) on described rectilinear direction, produce vibration to active force described mover (12), that change.
3. method according to claim 1 and 2 is characterized in that, the described step of pressure that provides comprises that use elastomeric element (16) provides this pressure.
4. method according to claim 3, the described step of described second friction surface (14) that provides comprising:
-described second friction surface (14) is provided on described stator (10); And/or
-described second friction surface (14) is provided on described elastomeric element (16).
5. according to the purposes of each described method in the claim 1 to 4, this purposes is to be used for focusing control eyeglass moving along lens light axis.
6. a linear motor (1) comprises mover (12) and is used to drive described mover (12) along the stator (10) that straight line (A) direction moves, and it is characterized in that described mover (12) has first friction surface (120), this motor (1) also comprises:
-press member (16);
Described stator (10) and/or described press member (16) have and contacted second friction surface of described first friction surface (120) (14);
Described press member (16) is used to described first and second friction surfaces (120,14) to provide mutual pressure, described pressure to make can produce the frictional force that described mover (12) is remained on its current location between described first and second friction surfaces (120,14).
7. linear motor according to claim 6 (1), it is characterized in that, described stator (10) is used for before the described mover of driving (12) begins from inactive state to move, make described mover (12) produce vibration, described vibration drives described mover (12) with described stator (10) and begins to move the stiction that need overcome from inactive state and change kinetic force of friction into.
8. linear motor according to claim 7 (1) is characterized in that, described stator (10) and mover (12) comprise in magnet and the coil one and another respectively, and this linear motor (1) also comprises:
-circuit is used for providing to described coil the electric current of variation, producing described stator (10) to active force described mover (12), that change, thereby makes described mover (12) produce vibration in described rectilinear direction.
9. according to each described linear motor (1) in the claim 6 to 8, it is characterized in that, described stator (10) drives described mover (12) and moves in the mode of segmentation, in each section, described mover (12) begins to move from inactive state, and quicken at least and slow down, get back to inactive state at last, and the difference of the mobile displacement of each section is less than certain threshold value.
10. linear motor according to claim 6 (1) is characterized in that, described press member (16) comprises elastomeric element.
11. linear motor according to claim 10 (1), it is characterized in that, on perpendicular at least one direction of described rectilinear direction, first friction surface (120) that second friction surface (14) that described elastomeric element (16) is relative is relative with described mover contacts, and provides mutual pressure for every pair of contacted first and second friction surfaces (120,14).
12. linear motor according to claim 11 (1), it is characterized in that, described elastomeric element (16) surrounds described mover (12) going up with the perpendicular cross section (P) of described straight line (A) direction, and each second friction surface (14) towards described mover (12) indent with the described mover of clamping (12)
Described stator (10) is arranged in the gap between described mover (12) and the described elastomeric element (16).
13. linear motor according to claim 12 (1), it is characterized in that, described elastomeric element (16) is made by electromagnetic shielding material, go up at described cross section (P) and to surround described stator (10) and described mover (12) closedly, and along the extension in the moving range of described mover (12) and/or the shared scope of described stator (10) at least of described rectilinear direction.
14. a focusing module is characterized in that, comprising:
-eyeglass (L);
-according to each described linear motor (1) in the claim 6 to 13, its mover (12) is fixedlyed connected with described eyeglass (L), and straight line (A) direction that mover (12) moves is consistent with the optical axis of described eyeglass (L).
15. a picture catching module is characterized in that, comprises
-imageing sensor (S);
-focusing module according to claim 14 is used for eyeglass (L) is moved along optical axis, focuses to described imageing sensor with the light that will inject eyeglass.
16. the electronic equipment with image capture function is characterized in that, comprises picture catching module according to claim 15.
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| CN201110130021.1A CN102195438B (en) | 2011-05-18 | 2011-05-18 | Method for achieving device for driving object to move in a linear mode and linear motor |
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| CN201110130021.1A CN102195438B (en) | 2011-05-18 | 2011-05-18 | Method for achieving device for driving object to move in a linear mode and linear motor |
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| CN104976987A (en) * | 2015-07-10 | 2015-10-14 | 四川金码科技有限公司 | Apparatus and method for overcoming hydrostatic level gauge static friction force and improving precision |
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