CN100367064C - Lens driving mechanism - Google Patents
Lens driving mechanism Download PDFInfo
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- CN100367064C CN100367064C CNB2004100860184A CN200410086018A CN100367064C CN 100367064 C CN100367064 C CN 100367064C CN B2004100860184 A CNB2004100860184 A CN B2004100860184A CN 200410086018 A CN200410086018 A CN 200410086018A CN 100367064 C CN100367064 C CN 100367064C
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- sleeve
- driving mechanism
- magnet
- conductor coils
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Abstract
The present invention relates to a lens driving mechanism which is provided with a lens sleeve for covering a lens. The outer surface of the lense sleeve is surrounded and fixed with a conductor coil which is surrounded by a spring. A magnet is opposite to the conductor coil, and the magnetic lines of the magnet face to and cut the conductor coil. At the moment, the conductor coil generates an action to drive the lens sleeve to move after a current passes the conductor coil. Adjusting the current magnitude on the conductor coil can control the strength of the action and the position of the lens sleeve.
Description
Technical field
The present invention relates to a kind of driving mechanism of camera lens, but particularly relate to a kind of autofocus lens driving mechanism.
Background technology
Along with the progress of photographic technology, modern camera apparatus all has the function of focusing mostly, can both be clearly in the camera imaging so that be positioned at the object at different distance place.And so-called focusing is the position of adjusting camera lens, and the light that enters in the camera can be focused on the position the most correct in the camera, and so captured image could clearly be noted down among camera.
Yi Qian traditional camera is the mode that adopts manual focus the earliest, just utilizes manual mode to adjust the position of camera lens, and the correct position of with the naked eye judging camera lens again whether.Though be easier to make the cameraman to obtain satisfied focusing result with manual focusing mode, therefore the relative difficulty of using that also increased, has just had the appearance of full-automatic camera concerning non-professional camera user.Full-automatic camera can the cameraman during at filmed image earlier automatically with focal length to good, and then image noted down, so not only reduced the use difficulty of camera, the mode of focusing has also reduced the chance of focusing failure automatically.
Simple focusing method automatically can have a processor and a lens driving apparatus in the camera usually.Processor can capture the light signal and see through the optimum position that some algorithms calculate camera lens, and then via lens driving apparatus camera lens is moved to suitable position.Drive unit generally can utilize general rotary motor to reach the purpose of moving lens, but because camera lens is to adopt the past of straight line to cover the formula mode of motion, so between rotary motor and camera lens, must have one rotate-stationary mode can be converted to the gear train that orthoscopic is moved.This gear train generally is made up of cam sleeve and toothed gearing, and bulky and difficult design is carried the difficulty that application is arranged on the product at mobile phone etc.
Moreover, integration trend according to electronic product, camera no longer has been simple camera, but can with mobile phone or personal digital assistant (Personal Digital Assistant, the portable apparatus of equipment combination such as PDA), therefore miniaturization also is important considering in design.With traditional camera lens kind of drive, rotary motor has not only occupied sizable volume, and will consider the shared space of gear train.So the miniaturization of this kind camera module has its limit in fact.
Take a broad view of the above, along with the raising that focusing degree of accuracy and product miniaturization etc. require, real must be a kind of more accurate, be easier to control, lens driving mechanism that volume is littler.
This shows that above-mentioned existing lens driving mechanism obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem that lens driving mechanism exists, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that above-mentioned existing lens driving mechanism exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of lens driving mechanism of new structure, can improve general existing lens driving mechanism, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective that existing lens driving mechanism exists, and a kind of lens driving mechanism of new structure is provided, technical matters to be solved is to make its setting accuracy height, is easy to control, and volume is little, thereby be suitable for practicality more, and have the value on the industry.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of lens driving mechanism that the present invention proposes, it comprises: a lens sleeve, and wherein the inside of this lens sleeve is enough to hold and fixes a lens assembly, and has a flange and vertically extend from the outside surface of this lens sleeve; One conductor coils, around and be fixed in the outside surface of this lens sleeve; One elastic device is surrounded on around this lens sleeve; One mechanism's sleeve, wherein the inside of this mechanism's sleeve is enough to hold this lens sleeve and this elastic device; An and magnetic devices, be disposed at the inside surface of this mechanism's sleeve, and this magnetic devices is made up of at least one group of magnets, wherein each this at least one group of magnets is all combined by the permeability magnetic material between pair of magnet and this pair of magnet, this pair of magnet has identical magnetic with the surface that this magnetic conductor engages, wherein, when this lens sleeve and this elastic device being placed this mechanism sleeve, this magnetic devices can be relative with this conductor coils, make when this conductor coils upper reaches is connected with an electric current, this conductor coils can produce an acting force and drive this lens sleeve and move, this lens sleeve is when mobile, this flange and this magnetic devices together with the time compress this elastic device from the two ends of this elastic device respectively, so that this elastic device produces a reacting force to this lens sleeve, can control this effect intensity of force via adjusting this current's intensity, with obtain and this reacting force between balance, by this this lens sleeve is moved to required position.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid lens driving mechanism, the outside surface of wherein said lens sleeve have the groove around this lens sleeve, and this conductor coils is to be fixed on this lens sleeve in the mode that is wound in this groove.
Aforesaid lens driving mechanism, wherein said elastic device are a spring.
Aforesaid lens driving mechanism, wherein said elastic device are a leaf spring (flat spring).
Aforesaid lens driving mechanism, wherein said pair of magnet are neodymium (neodymium) iron boron magnets.
Aforesaid lens driving mechanism, it more comprises a focal control circuit, in order to control the size of this electric current.
Aforesaid lens driving mechanism, wherein said focal control circuit are a processor.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, major technique of the present invention thes contents are as follows:
The present invention proposes a kind of lens driving mechanism, and this kind lens driving mechanism is by one first cylinder, a magnetisable material (being a permanent magnet), and a conductor coils, an elastic material, one second cylinder and a lens assembly are formed.First cylinder and second cylinder are all hollow shape, and two ends all respectively have an opening, and wherein the size of first cylinder is enough to surround second cylinder.The internal fixation of second cylinder lens assembly, conductor coils then by around and be fixed on the outside surface of second cylinder, second cylinder also has a collar flange and vertically extends from the outside surface of second cylinder, this collar flange is used to carry elastic material, make elastic material can be centered around second cylinder around.Magnetisable material is installed on the inside surface of first cylinder, when second cylinder enters the inside of first cylinder, conductor coils at least can some and magnetisable material vis-a-vis, just say that also conductor coils all can have at least a portion to be in the magnetic line of force scope of magnetisable material at any time, and the magnetic line of force of magnetisable material can vertically pass through conductor coils.
When after applying electric current on the conductor coils,, therefore can produce an acting force and drive second cylinder and advance, and the size of electric current is to be directly proportional with the size of acting force because the magnetic line of force direction that sense of current and magnetisable material are sent is mutually perpendicular.When second cylinder advanced, the elastic material between collar flange and magnetisable material can be squeezed because of collar flange and moving closer to of magnetisable material, and second cylinder is produced a reacting force.So, as long as utilize the Control current size to come balance between corrective action power and the reacting force, just can determine second cylinder and the position that is positioned at its inner lens assembly.As long as also therefore can carry out the fine setting of high-fineness to size of current, then the setting accuracy of camera lens also can improve.
Lens driving structure of the present invention has the lens sleeve that a jacket camera lens, and the surface is around being fixed with a conductor coils and being surrounded by a spring outside this lens sleeve.One magnet and conductor coils vis-a-vis, the magnetic line of force that this magnet provided can towards and cut conductor coils, just can produce an acting force after this moment conductor coils being passed to electric current, and related drive lens sleeve moves to conductor coils.Utilize the size of current of adjusting on the conductor coils, the position of may command effect intensity of force and lens sleeve.
In sum, the lens driving mechanism of special construction of the present invention, its setting accuracy height is easy to control, and volume is little.It has above-mentioned many advantages and practical value, and in like product, do not see have similar structural design to publish or use and really genus innovation, no matter it all has bigger improvement on the structure of product or function, have large improvement technically, and produced handy and practical effect, and more existing lens driving mechanism has the multinomial effect of enhancement, thus be suitable for practicality more, and have the extensive value of industry, really be a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
Description of drawings
Figure 1A is the lens driving mechanism decomposing schematic representation of the embodiment of the invention.
Figure 1B is the lens driving mechanism sectional view of the embodiment of the invention.
Fig. 2 A is the lens driving mechanism action synoptic diagram of the embodiment of the invention.
Fig. 2 B is the lens driving mechanism action synoptic diagram of the embodiment of the invention.
100: lens driving mechanism 102: lens sleeve
104: flange 106: groove
108: camera lens 110: conductor coils
112: spring 114: magnet
116: magnetic conductor 118: mechanism's sleeve
120: the magnetic line of force 122: direction
202: magnet 204: conductor coils
206: the magnetic line of force 208: direction
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to its embodiment of lens driving mechanism, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
Basic conception of the present invention is that the acting force that utilizes electric current and magnetic line of force reciprocation to be produced comes the position of controls lens, utilize this kind mode can under the situation that need not add gear train, directly drive camera lens carry out orthoscopic toward covering motion, and can reach high accurate positioning degree with simple control mode.
Seeing also shown in Figure 1A, is the decomposing schematic representation of one embodiment of the invention.By some main elements that can find out among the figure in the lens driving mechanism 100, magnetic conductor 116 between lens sleeve 102, camera lens 108, conductor coils 110, spring 112, two magnet 114, two magnet 114 and the mechanism's sleeve 118 that envelopes whole driving mechanism are arranged wherein.
Wherein the inside of lens sleeve 102 can hold and fix camera lens 108, on the outer surface of lens sleeve 102 then around and fixing conductor coils 110.Be to utilize the annular ditch groove 106 be looped around on lens sleeve 102 outside surfaces to fix conductor coils 110 in the present embodiment, that is, conductor coils 110 is looped around among the annular ditch groove 106.In addition, the outside surface of lens sleeve 102 extends a flange 104 vertical with outside surface.When with spring 112 ring sets around the lens sleeve 102 time, the flange 104 and the spring 112 of lens sleeve 102 just can contact with each other, and live spring 112 with carrying and lens sleeve 102 are unlikely penetrate spring 112 and go out.
Mechanism's sleeve 118 can envelope all above-mentioned elements, and promptly inner jacket is lived camera lens 108, the outside be wound with conductor coils 110 and for 112 on spring around lens sleeve 102.The magnet 114 of two ring-types and the magnetic conductor 116 that is clipped between two magnet 114 all are fixed on the inside surface of mechanism's sleeve 118.
Seeing also shown in Figure 1B, is each element group among Figure 1A sectional view after upright, and the sectional view of promptly whole lens driving mechanism 100 can more be clear that the relative position between each element.Lens sleeve 102 gets up camera lens 108 jackets, conductor coils 110 is wrapped among the annular ditch groove 106 on lens sleeve 102 outside surfaces, spring 112 is around lens sleeve 102, one end of spring 112 also joins with flange 104 on lens sleeve 102 outside surfaces, at last, internal surface configurations the magnetic conductor 116 between two magnet 114 and two magnet arranged mechanism's sleeve 118 again with lens sleeve 102 entirely jacket live.Wherein, the position of magnet 114 and magnetic conductor 116 must be facing to conductor coils 110, that is to say that the magnetic line of force of being launched by magnet 114 and magnetic conductor must cut conductor coils 110.In addition, with the direction of Figure 1B, the position of magnet 114 must be when lens sleeve 102 driving spring 112 and is moving right, and can connect with spring 112 to contact, in order to the spring 112 of extruding between flange 104 and magnet 114.
Seeing also shown in Fig. 2 A, is the lens driving mechanism action synoptic diagram of the embodiment of the invention.Lens location control method of the present invention because the position of the mechanism's sleeve 118 in the lens driving mechanism 100 is fixed, does not therefore all illustrate out with the mechanism's sleeve 118 among Figure 1B in reaching Fig. 2 B.See that at first the surface that two magnet 114 engage with magnetic conductor 116 is all the N magnetic pole, another surface that does not engage with magnetic conductor 116 then is all the S magnetic pole.By the characteristic of magnetisable material as can be known, the magnetic line of force can shoot to the S magnetic pole by the N magnetic pole of magnetisable material, so in the middle of the emitted magnetic line of force of the magnet among Fig. 2 A 114, has part via magnetic conductor 116 guiding, and directive and cut the magnetic line of force 120 of conductor coils 110.
According to Lao Lunsi law (Lorentz Law) as can be known, if apply electric current this moment on conductor coils 110, then can produce a directed force F towards direction 122 on conductor coils 110, its size is:
F＝rIL×B
Wherein,
I is the strength of current on the conductor coils 110;
L is the total length of conductor coils 110;
B is a magnetic flux density; And
R is the length of conductor coils 110 in magnetic field and the ratio of its total length.By finding out in the mechanism of present embodiment, the total length L of conductor coils 110 is a fixed value, produce from magnet 114, the magnetic flux density B of the magnetic line of force 120 by conductor coils 110 also is a fixed value, and because magnet 114 around conductor coils 110, conductor coils 110 integral body are all the magnetic line of force 120 and cut, so ratio r can be considered as 1.In this case, the size of directed force F is only relevant with the strength of current I that stayed on the conductor coils 110, and both are also proportional, that is to say that the electric current of the conductor coils 110 of flowing through is big more, and then the acting force towards direction 122 is strong more on the conductor ring.
Because conductor coils 110 is fixed on the lens sleeve 102, therefore when conductor coils 110 is driven by the acting force towards direction 122, lens sleeve 102 and be fixed in wherein camera lens 108 and also can be inconjunction with past direction 122 and move.Along with lens sleeve 102 moving toward direction 122, spring 112 can be pushed because of flange 104 and dwindling of magnet 114 relative positions, therefore to lens sleeve 102 generations one and direction 122 opposite reaction, this reacting force can along with spring 112 be squeezed degree increase and increase, that is to say if lens sleeve 102 wants that bigger amount of movement is arranged, just must on conductor coils 110, add more powerful electric current, then on direction 122, will produce bigger acting force with the reacting force of opposing from spring 112.When acting force and reacting force reached balance, lens sleeve 102 just can stop on the fixed position with camera lens 108.By above-mentioned principle as can be known, if the size of current of the conductor coils 110 of will flowing through controlled, just lens sleeve 102 can be moved to the position of being wanted.Behind the electric current of the conductor coils 110 of having ended to flow through, lens sleeve 102 can be got back to initial position because of the reacting force of spring 112.
In the represented embodiment of Fig. 2 A, be that the annular magnetizer 116 that utilizes two ring-shaped magnets 114 and can improve magnetic flux density is formed.In Fig. 2 B, provide another kind only to realize embodiments of the invention with a ringshaped magnet.Among Fig. 2 B among represented structure and Fig. 2 A represented structure be similar, only there is the part of magnet to make only to have a ringshaped magnet 202 into, wherein magnet 202 has the N magnetic pole with conductor coils 204 facing surfaces, then has the S magnetic pole back to the surface of conductor coils 204.Hence one can see that, and the magnetic line of force 206 that magnet 202 launched equally is to penetrate toward the direction of conductor coils 204, and similarly cut conductor coils 204, so after passing to electric current on the conductor coils 204, equally can produce a acting force, and its principle and control mode are all identical with the embodiment shown in Fig. 2 A towards direction 208.
What be illustrated is, the any magnetisable material of being mentioned in the above-mentioned explanation that fixed magnetic field is provided of magnet general reference, as common magnet or electromagnet, be to have utilized neodymium iron boron (Nd-Fe-B) magnet in the above-described embodiment with high residue magnetic flux density and coercive force characteristic.Magnetic conductor is then made a general reference the permeability magnetic material that the magnetic line of force can be compiled for the uniform magnetic field of high magnetic flux density for any.Spring then can be replaced by any elastic material with restoring force, as flat reed or blob of viscose etc.
By in the above relevant explanation of lens driving mechanism as can be known, as long as in conductor coils, impose the electric current of suitable size, camera lens can be moved to desired position.Therefore use in the varifocal camera of this kind lens driving mechanism one, only need to add a focal control circuit, just easily moving lens to reach the purpose of zoom.Wherein this focal control circuit can be looked actual the electric current that situation is calculated and output is suitably big or small, so can use the element as processor to be realized.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (7)
1. lens driving mechanism is characterized in that it comprises:
One lens sleeve, wherein the inside of this lens sleeve is enough to hold and fixes a lens assembly, and has a flange and vertically extend from the outside surface of this lens sleeve;
One conductor coils, around and be fixed in the outside surface of this lens sleeve;
One elastic device is surrounded on around this lens sleeve;
One mechanism's sleeve, wherein the inside of this mechanism's sleeve is enough to hold this lens sleeve and this elastic device; And
One magnetic devices, be disposed at the inside surface of this mechanism's sleeve, and this magnetic devices is made up of at least one group of magnets, wherein each this at least one group of magnets is all combined by the permeability magnetic material between pair of magnet and this pair of magnet, this pair of magnet has identical magnetic with the surface that this magnetic conductor engages
Wherein, when this lens sleeve and this elastic device being placed this mechanism sleeve, this magnetic devices can be relative with this conductor coils, make when this conductor coils upper reaches is connected with an electric current, this conductor coils can produce an acting force and drive this lens sleeve and move, this lens sleeve is when mobile, this flange and this magnetic devices together with the time compress this elastic device from the two ends of this elastic device respectively, so that this elastic device produces a reacting force to this lens sleeve, can control this effect intensity of force via adjusting this current's intensity, with obtain and this reacting force between balance, by this this lens sleeve is moved to required position.
2. lens driving mechanism according to claim 1, the outside surface that it is characterized in that wherein said lens sleeve has the groove around this lens sleeve, and this conductor coils is to be fixed on this lens sleeve in the mode that is wound in this groove.
3. lens driving mechanism according to claim 1 is characterized in that wherein said elastic device is a spring.
4. lens driving mechanism according to claim 1 is characterized in that wherein said elastic device is a leaf spring.
5. lens driving mechanism according to claim 1 is characterized in that wherein said pair of magnet is a ndfeb magnet.
6. lens driving mechanism according to claim 1 is characterized in that it more comprises a focal control circuit, in order to control the size of this electric current.
7. lens driving mechanism according to claim 6 is characterized in that wherein said focal control circuit is a processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100860184A CN100367064C (en) | 2004-10-22 | 2004-10-22 | Lens driving mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100860184A CN100367064C (en) | 2004-10-22 | 2004-10-22 | Lens driving mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN1763577A CN1763577A (en) | 2006-04-26 |
| CN100367064C true CN100367064C (en) | 2008-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100860184A Expired - Fee Related CN100367064C (en) | 2004-10-22 | 2004-10-22 | Lens driving mechanism |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295062B (en) | 2007-04-29 | 2010-09-29 | 鸿富锦精密工业（深圳）有限公司 | Lens module and camera module group |
| CN101571659B (en) * | 2008-04-28 | 2014-01-15 | 富准精密工业(深圳)有限公司 | Auto-focus structure of camera |
| JP2011521285A (en) * | 2008-05-14 | 2011-07-21 | ハイソニック カンパニー，リミテッド | Video shooting device with shake correction function |
| CN101587221B (en) * | 2008-05-23 | 2016-02-17 | 赛恩倍吉科技顾问（深圳）有限公司 | The lens group of camera module |
| CN101604063B (en) * | 2008-06-13 | 2011-11-09 | 富准精密工业(深圳)有限公司 | Camera structure |
| KR20110089845A (en) * | 2008-10-14 | 2011-08-09 | 주식회사 홍콩 어플라이드 사이언스 앤드 테크놀로지 리서치 인스티튜드 | Multi-drive mechanism lens actuator |
| JP2011059274A (en) * | 2009-09-08 | 2011-03-24 | Micro Uintekku Kk | Lens drive device |
| CN105136042A (en) * | 2015-08-20 | 2015-12-09 | 广东欧珀移动通信有限公司 | Height measuring method and apparatus, and mobile terminal |
| CN109643023A (en) * | 2017-06-26 | 2019-04-16 | 深圳市柔宇科技有限公司 | Display module and wear-type electronic equipment |
| JP6780203B2 (en) * | 2018-10-29 | 2020-11-04 | ビクター ハッセルブラッド アクチボラーグＶｉｃｔｏｒ Ｈａｓｓｅｌｂｌａｄ Ａｂ | Control device, imaging device, control method, and program |
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| JP2004138992A (en) * | 2002-10-18 | 2004-05-13 | Shicoh Eng Co Ltd | Lens driving device |
| CN1514296A (en) * | 2002-12-31 | 2004-07-21 | Lens driving device |
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| CN1368658A (en) * | 2001-02-09 | 2002-09-11 | 力捷电脑股份有限公司 | Automatic focusing mechanism and method |
| JP2002365514A (en) * | 2001-06-06 | 2002-12-18 | Shicoh Eng Co Ltd | Lens drive device |
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| CN1763577A (en) | 2006-04-26 |
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