CN101551507A - Lens driving mechanism using electromagnets - Google Patents

Abstract

The invention relates to a lens driving mechanism using electromagnets, which is used for driving a lens to slide and move in a chamber of a lens module along a central shaft. The lens driving mechanism using electromagnets comprises a coil and a plurality of electromagnets, wherein the coil is fixedly sleeved on a lens sleeve barrel and synchronously moves along with the lens; the electromagnets corresponding to the coil are arrayed on the inner and outer edges or the upper and lower edges of the coil and keep still; each electromagnet is provided with an electromagnetic core; the tail end section of the electromagnetic core can vertically face to the current direction of the coil; the electromagnets can respectively control the current of the electromagnets to control the strength or the direction of electromagnetic force generated by the electromagnets, and the deviation angle of the central shaft can be regulated by the lens sleeve barrel to achieve anti-shake function. The invention is beneficial to the miniaturization of the lens module; because the lens driving mechanism does not comprise permanent magnets, the lens driving mechanism avoids the problems that the magnetic force is nonuniform or the strength of the magnetic force can not be individually controlled, and the lens module can resist the reflow high temperature to increase the production probability.

Description

Use the lens driving mechanism of electromagnet

Technical field

The present invention is relevant a kind of lens driving mechanism that uses electromagnet, be the camera lens module that is applied to an automatic focusing or zoom, refer to the driving mechanism that a kind of electromagnetic force of utilizing coil and electromagnet to be produced endwisely slips and is shifted with driving and controls lens especially after energising.

Background technology

At present on the portable electric devices such as the mobile phone of the digital camera that uses, tool shoot function, laptop, standing have (an auto-focusing that can focus automatically, be called for short AF) or miniature lens module (the compact camera module of zoom (zooming), be called for short CCM), and this camera lens module comprises basically: one by loam cake (upper cover) and bottom (bottom cover) formed cavity volume (housing); One camera lens (lens), it is made up of an eyeglass group (lens group) and a lens sleeve (lens holder), slidably is set in the cavity volume and can be along transitional slide before and after the central axis direction; And a lens driving mechanism (lensdriving/displacement mechanism), or being called actuator (actuator), it mainly produces shift motion in order to drive this camera lens on central shaft, use the effect of reaching automatic focusing or zoom.

The design of common lens driving mechanism, comprise: as a kind of piezo-electric motor (piezoelectricmotor) that is called, it is to utilize piezoelectricity (piezoelectric) material to make, as US7,212,358, US2003/0227560, JP2006-293083, JP2006-101611 etc.; But general employed piezoelectric can't tolerate the high temperature (about 260 ℃) of reflow (reflow) operation, or the special piezoelectric of withstand high temperatures is quite expensive again, so be unfavorable for mass production or reduce manufacturing cost.Another is called voice coil motor (voice coilmotor, abbreviation VCM) driving mechanism, it is to utilize coil, magnet, cooperate formation with elastic component (as spring or shell fragment), as US7,262,927, US7,196,978, US7,002,879, US6,961,090, US6,687,062, US20070133110, JP2005037865, JP2005258355, WO2007026830 etc., these prior art major parts are to utilize coil and permanent magnet (permanent magnet) combo to use, as Fig. 1, as enclosing in coil 31 or peripheral annular arrangement is provided with one or several permanent magnets 70, make coil 31 energising back produce magnetic field, and the electromagnetic force that forms up or down between the magnetic field that can and be set up by one or several permanent magnets 70 and the magnetic pole move with the driving camera lens; But permanent magnet (about 260 ℃) when reflow high temperature will make the magnet demagnetization.Therefore the piezo-electric motor of above-mentioned prior art and voice coil motor neither reflow mode of using when assembling cause on volume production efficient and are restricted.Moreover, having a kind of is the lens driving mechanism that utilizes marmem (shaped memory alloy, be called for short SMA), and it is to utilize the characteristic of pyrocondensation cold expanding of SMA with the drive force source as actuator (actuator), as US 6,307,678B2, US 6,449,434B1, US2007058070, US2007047938, JP2005275270, JP2005195998 etc., yet the action of SMA pyrocondensation cold expanding is slower, can't simple and easyly reach the effect of instant focusing automatically or zoom.

For the user that the high image quality demand is arranged, be to keep quite outstanding action edge and take pictures quality at the environment of low-light (level), anti-hand shake (Anti hand-shake) function gradually is subjected to suitable attention.In the prior art, anti-hand shake technology is mainly reached by several modes, offset the image fog influence that is caused in the vibrations process as image-forming component CCD by compensating motion with machinery mount, or as be provided with the shake of mechanical structure elimination hand at camera lens, or in the mode of computed in software compensation, or raising light sensitivity ability, or adopt gyroscope to carry out level and the vertical vibration of image-forming component CCD are detected, and utilize magnetic force to promote to compensate action etc., as EP1729509, US20070292119, US20070009243, JP08122840, JP11305280, JP11220651 etc.

Use the major impetus source of electromagnetic force as lens driving mechanism, have its convenience and versatility, for (about 260 ℃) magnetic not being damaged when the reflow high temperature, make high temperature resistant permanent magnet though can use special material, but it one is that price is too expensive therefore, and it therefore two can't control its magnetic force size individually for permanent magnet; Therefore develop new technology to solve lens driving mechanism reflow problem and to avoid the uneven problem of indivedual permanent magnet magnetic force, will be for urgently required.

Summary of the invention

The objective of the invention is to overcome the above-mentioned shortcoming of prior art, a kind of electromagnetic force lens driving mechanism that replaces permanent magnet with electromagnet is provided.

For this reason, the invention provides a kind of lens driving mechanism that uses electromagnet, it is to utilize coil (conductor coil) and several electromagnet (electromagnet) to form, wherein this coil be fixedly arranged on the lens sleeve with the same moved further of camera lens, and these several electromagnet are outer rim or inner edge or upper limb or the lower edges that are arranged at coil with respect to coil with the equal angles spacing arrangement, and be maintained fixed motionlessly, and make the tail end section of the iron core of each electromagnet vertically be intended for the direction of current of this coil; By this, can utilize coil and electromagnet after energising, by acting force and the force direction that Ampere's right-handed screw rule caused, to drive and the controls lens displacement that endwisely slips; Wherein when coil is imposed the electric current of different directions, the may command camera lens advances or direction of retreat axially displaced, to be applicable to the camera lens module of focusing or zoom automatically; This driving mechanism can anti-reflow (reflow) high temperature and help mass production again, can improve the difficulty that prior art is used permanent magnet can't use the difficulty of back welding process and avoided uneven or uncontrollable its magnetic force size of indivedual permanent magnet magnetic force.

The present invention also provides a kind of lens driving mechanism that uses electromagnet, wherein these several electromagnet are the lower edge face places (or upper limb face place) that are arranged at the ring of close this coil with the equal angles spacing arrangement, and each electromagnet has the lower edge face below (or upper limb face top) that a cylindricality electromagnetic core is positioned at coil, use and reduce the electromagnet area occupied, and the tail end section of iron core can be vertically upward towards the lower edge face of coil (or vertically downward towards upper limb face of coil); Or these several electromagnet are the outer edge surface places (or inner edge surface place) that are arranged at the ring of close this coil with the equal angles spacing arrangement, and the iron core of each electromagnet has a long arc shape section with outer edge surface (or inner edge surface) arc with respect to the ring of coil, use and reduce shared diameter of electromagnet or height, to reach lens shift and to help the miniaturization purpose of camera lens module.

The lens driving mechanism of the another use electromagnet of the present invention, but wherein the end corner of the electromagnet core of electromagnet form a short radial section so that its tail end section by tangential direction change into radial direction with vertical plane to coil, but make the electromagnet can be by the more magnet coil number of turn of iron core winding to strengthen the electromagnetic force of electromagnet; But the tail end section of its iron core produces the direction of current of electromagnetism direction vertical plane to coil after the electromagnet energising by this, pass through Ampere's right-handed screw rule, cause the axially displaced direction identical (or opposite) of the lens driving power that produced and camera lens, so that enough electromagnetic force to be provided, help promoting the driving efficient of camera lens.

The lens driving mechanism of use electromagnet of the present invention, it further can be by control each current of electromagnet size or direction of current, be subjected to different big or small electromagnetic force effects after making coil electricity, but cause the optical axis of camera lens and the central shaft of camera lens module to produce a deviation angle and subtend object being shot, reach the automatic focusing or the Zoom effect of anti-hand shake.

The lens driving mechanism of use electromagnet of the present invention, it further can dispose a spring on lens sleeve, make the electromagnetic force disappearance between coil and electromagnet group or do not produce and do the time spent, this spring can provide a relative restoring force to lens sleeve, so that this camera lens returns back to former balance state or original position and reaches automatic focusing or Zoom effect.

Structural design of the present invention has following advantage compared with the prior art at least:

＜1 〉, the lens driving mechanism 3 of use electromagnet of the present invention is to utilize electromagnet replacing permanent magnet, can the high temperature of anti-the reflow, can improve the possibility of mass production.

＜2 〉, lens driving mechanism 3 as first embodiment and second embodiment of use electromagnet of the present invention, it is to utilize several electromagnet to be arranged at the lower edge face place (or upper limb face place) of close this coil with the equal angles spacing arrangement, make the cylindricality electromagnetic core of each electromagnet be positioned at the below (or top of upper limb face) of the lower edge face of coil, and the magnetic force direction that tail end section produces of each electromagnetic core is the direction of current of (or downwards) vertical plane to coil that make progress, and generation is parallel to the acting force of the central shaft Z of lens sleeve, so the miniaturization that helps camera lens module reduces the diameter of camera lens module and the driving efficient that can promote camera lens.

＜3 〉, the lens driving mechanism 3 as the 3rd embodiment of use electromagnet of the present invention, it is to utilize several electromagnet to be arranged at the outer edge surface place (or inner edge surface place) of close this coil with the equal angles spacing arrangement, make the cylindricality electromagnetic core of each electromagnet be positioned at the outer edge surface (or inner edge surface) of coil, and the magnetic force direction that tail end section produces of each electromagnetic core be radially vertical plane to the direction of current of coil, and generation is parallel to the acting force of the central shaft Z of lens sleeve, help the miniaturization of camera lens module so can reduce the height of camera lens module, and the driving efficient that can promote camera lens.

＜4 〉, lens driving mechanism 3 as second embodiment and the 3rd embodiment of use electromagnet of the present invention, the electromagnetic core of its each electromagnet comprises a long arc shape section and a short vertical section (second embodiment) or short radial section (the 3rd embodiment), make the enough magnet coil numbers of turn of this long arc shape Duan Shangke winding so that its tail end section can produce enough magnetic field, so help promoting the driving efficient of camera lens.

＜5 〉, the lens driving mechanism 3 of use electromagnet of the present invention can independently control the magnetic field that each electromagnet 32 is produced, and makes it can reach anti-hand shake function.

Description of drawings

Fig. 1 is the schematic perspective view of an existing lens driving mechanism;

Fig. 2 is the perspective exploded view of first embodiment of the invention;

Fig. 3 is the partial schematic diagram of Fig. 2;

Fig. 4 is the side illustration figure of Fig. 2 one mode of operation;

Fig. 5 is the anti-hand shake key diagram of Fig. 2;

Fig. 6 is the perspective exploded view of second embodiment of the invention;

Fig. 7 is the partial schematic diagram of Fig. 6;

Look synoptic diagram on Fig. 8 Fig. 7;

Fig. 9 is the anti-hand shake key diagram of Fig. 6;

Figure 10 is the perspective exploded view of third embodiment of the invention;

Figure 11 is the partial schematic diagram of Figure 10;

Figure 12 is the schematic top plan view of Figure 11.

Description of reference numerals

1-camera lens module (lens module); 11-loam cake (upper cover); 12-bottom (bottomcover); 2-camera lens (lens); 21-eyeglass group (lens group); 22-lens sleeve (lens holder); 3-lens driving mechanism (lens driving mechanism); 31-coil (conductor coil); 311-lower edge face; 312-upper limb face; The 313-outer edge surface; 32,321～324-electromagnet (electromagnet); 33-conducting strip (electric plate); 34-coil electrode (coil pad); 35,351～354-electromagnet electrode (electromagnet pad); 36-electromagnetic core (electromagnet ferrite); The 361-tail end section; 362-long arc shape section; The short vertical section of 363-; The 364-tail end section; 365-long arc shape section; The short radial section of 366-; The 367-tail end section; 37-controller (controller); 38-spring (spring element); 70-permanent magnet (permanent magnet).

Embodiment

For making the present invention clear and definite more full and accurate, enumerate preferred embodiment now and cooperate following accompanying drawing, structure of the present invention and technical characterictic thereof are described in detail as the back:

The following embodiment that is disclosed of the present invention, be at the present invention use electromagnet lens driving mechanism the main composition element and explain, though therefore the following embodiment that is disclosed of the present invention is applied in an automatic focusing or the zoom lens module, but with regard to the camera lens module that generally has automatic focusing or zoom function, except disclosed lens driving mechanism, other structures are the General Notifications technology, therefore the personage who generally is familiar with this skill understands, the structure of disclosed camera lens module is not restricted to the following embodiment that discloses, it can carry out many changes, revise, even equivalence change, for example: the shape by loam cake and formed profile of bottom and cavity volume in this camera lens module does not limit, the design of the profile of camera lens module and inner space just do not limit as shown in Figure 2 square camera lens module or circular camera lens module as shown in Figure 6; Or the global shape or the structure of the camera lens of being made up of an eyeglass group and a lens sleeve do not limit yet, can comprise the eyeglass group who constitutes by single eyeglass or several eyeglasses as this eyeglass group, and single eyeglass or eyeglass group can speak for sb. beforehand generally and be located in the fixture and combine with a lens sleeve and form a camera lens; Or the circle of coil of the present invention and each magnet coil (turn) number, internal coil diameter (or internal coil diameter sectional area), coil height, electromagnet interior loop height or electric current turnover direction and size etc. also do not limit, and can calculate according to Bi Ou-Sha Wa law (Biot-Savart Law) and relevant ampere right-hand law calculating formula, as following formula (1) and formula (2)

$\stackrel{\→}{B}=\frac{{\mathrm{\μ}}_0}{4\mathrm{\π}}\∫\frac{\mathrm{Id}\stackrel{\→}{l}\×\stackrel{\→}{r}}{r^2}---\left(1\right)$

$\stackrel{\→}{F}=I\stackrel{\→}{l}\×\stackrel{\→}{B}$

Wherein, B is a magnetic density, μ ₀Be space permeability (permeability) that I is coil current (Amp), the 1st, line segment length, r are distances, F is stressed size.By formula (1) and formula (2) can calculate respectively the magnetic density of electromagnet of the present invention and the stressed size of coil use cooperate camera lens weight with the designing optimal driving force.

Shown in figure 2,3,4, the lens driving mechanism 3 of use electromagnet of the present invention can be applicable in the camera lens module 1 of an automatic focusing or zoom, this camera lens module 1 comprises loam cake 11 and bottom 12 formed cavity volumes at least, for a camera lens 2 can the central shaft Z direction in cavity volume on transitional slide; This camera lens 2 generally comprises an eyeglass group 21 who is made of single eyeglass or several eyeglasses and for the lens sleeve 22 that is installed with this eyeglass group 21, just forming one by eyeglass group 21 and lens sleeve 22 can synchronization-moving camera lens 2, and is set in the cavity volume and can be to advance or the direction of retreat transitional slide on central shaft Z.

The lens driving mechanism 3 of use electromagnet of the present invention mainly comprises a coil (conductorcoil) 31 and several electromagnet (electromagnet) 32, wherein, this coil 31 is to be fixedly arranged on the lens sleeve 22 of camera lens 2 to form interlock bodies and can same moved further with eyeglass group (lens group) 21 is common; These several electromagnet 32 can be three, four or more than, it is outer, inner edge surface (313) or the upper and lower edge face (312,311) that is arranged at coil 31 with respect to coil 31 with the equal angles spacing arrangement, and be maintained fixed motionlessly in camera lens module 1, and tail end section 361 vertical planes of iron core 36 that make each electromagnet 32 are to this coil 31; By this, can utilize magnetic direction that coil 31 and electromagnet 32 produced direction of current after energising, and produce electromagnetic force, to drive and the controls lens displacement that endwisely slips perpendicular to coil 31; Wherein when coil 31 is imposed the electric current of different directions, the may command camera lens with advance or direction of retreat axially displaced; Because this driving mechanism 3 does not contain permanent magnet, make the camera lens module can anti-reflow (reflow) high temperature, can improve prior art uses permanent magnet can't use the difficulty of back welding process, and help mass production, and avoid the difficulty of indivedual permanent magnet magnetic force inequalities or uncontrollable its magnetic force size.

The iron core 36 of aforesaid electromagnet 32 is made for utilizing soft magnetic material (soft magnets); The characteristic that this soft magnetic material has easy magnetization and easily demagnetizes, it is very easy to be magnetized in electromagnet 32 energising backs, the magnetic line of force can be concentrated on the tail end section 361 of electromagnetic core 36, but when electromagnet 32 no powers, the magnetic of electromagnetic core 36 also disappears immediately, and just soft magnetic material itself does not have the magnetized ability of maintenance; And at present the soft magnetic material Main Ingredients and Appearance can be puron (wrought iron, soft iron), steel, silicon steel, iron-nickel alloy (Fe-Ni Alloy or Permalloys), magnesium-zinc alloy (Mg-Zn alloy), nickel zinc alloy (Ni-Znalloy), MnZn alloy (Mn-Zn alloy) or metallic glass (metallic glass) etc. that carbon content is very low, all can tolerate reflow high temperature, can select according to various objectives.

The present invention uses the lens driving mechanism 3 of electromagnet further can control the size of current or the direction of current of each electromagnet 32 respectively, to control each electromagnet 32 magnetic field intensity that produced, make coil 31 energising back because of and each electromagnet 32 between electromagnetic force vary in size, cause the unbalanced electromagnetic force effect that is subjected to, make the optical axis of camera lens 2 produce an angle with optical center axle Z axle, make camera lens 2 can be offset this angle, reach anti-hand shake function with the subtend subject.

The present invention uses the lens driving mechanism 3 of electromagnet further can dispose a spring 38 with elasticity recovery function on camera lens 2, when the electromagnetic force between coil 31 and the electromagnet 32 disappears, this spring 38 can provide a relative restoring force to camera lens 2, uses so that camera lens 2 returns back to the preceding original position of electromagnetic force effect; Elasticity kenel as for this spring 38 can be as compression (compression) spring or extension formula (extension) spring; Structure kenel such as coil spring or non-coil spring; Number or set up position etc. not limit can need with the design of camera lens module 1 or camera lens 2 change.

＜the first embodiment 〉

Shown in figure 2,3,4, the lens driving mechanism 3 of the use electromagnet of present embodiment comprises: a coil 31, a plurality of electromagnet 32, present embodiment be for using four electromagnet 32, and the conducting strip 33 that matches, coil electrode 34, electromagnet electrode 35 etc.; Wherein a plurality of electromagnet 32 are the example explanation with four electromagnet 321～324 but do not limit, as being designed to three electromagnet; And electromagnet electrode 35 is the example explanation with four electromagnet electrodes 351～354 of correspondence also but does not limit, as being designed to a magnet electrode (can't reach shockproof function this moment).During use,, import each electromagnet 32 (321～324) respectively via electromagnet electrode 35 (351～354) by the electric current of identical or different direction of controller (as the controller 37 of Fig. 4) the may command output of camera (flowing into or outflow) or size; Wherein, this coil 31 is sheathed to be fixed on the lens sleeve 22 and the ring body of coil 31 forms a flanged structure that outwards protrudes relatively shown in Fig. 3,4 on the ring periphery of lens sleeve 22, and just coil 31 can be designed to the lower edge face 311 of flat and wide shape with relative formation one suitable radial width; These four electromagnet 32 are to be arranged at lower edge face 311 places near this coil 31 with equal angles (as 90 degree) spacing arrangement, and each electromagnet 32 has a cylindricality electromagnetic core 36, at present embodiment is an arc column electromagnetic core 36, and be positioned at the below of the lower edge face 311 of coil 31, arrange to reduce electromagnet 32 shared radial width in camera lens module 1 by this, help the miniaturization of camera lens module 1, especially can reduce the diameter of camera lens module 1; The tail end section 361 of this electromagnetic core 36 is vertically upward towards the lower edge face 311 of coil 31 again, after electromagnet 32 energisings, tail end section 361 magnetic direction that produces of this electromagnetic core 36 lower edge face 311 of vertical plane that can make progress to coil 31, just this magnetic direction is perpendicular to the direction of current of coil 31, thereby generation is parallel to the acting force of the central shaft Z of lens sleeve 22 (camera lens 2), cause the driving force that camera lens 2 is produced can be identical, can promote the driving efficient of camera lens relatively with the axially displaced direction of camera lens 2.

The spring 38 that present embodiment uses be the coil spring made from spring steel and can be extension formula spring and be arranged in lens sleeve 22 and lower cover 12 between, when the driving force that is subjected to making progress after coil 31 passes to electric current moves, to drive lens sleeve 22 (camera lens 2) and move up, produce distortion with extension spring 38 this moment; After coil 31 cut off electric current, upwards electromagnetic force disappeared, and spring 38 is no longer stretched and reinstatement, will spur camera lens 2 homings.

The lens driving mechanism 3 of the use electromagnet of present embodiment further can be designed to the magnetic force size of independent each electromagnet 32 of control, it is respectively to enter each electromagnet 32 (321～324) with the electric current of output different directions or size via four electromagnet electrodes 35 (351～354) by controller 37, makes the different magnetic force that can produce the N utmost points or the S utmost point in the tail end section 361 of the electromagnetic core 36 of each electromagnet 32 (321～324); As shown in Figure 5, two electromagnet 321,323 are laid in the relative position of 180 degree at interval relatively, when the user holds camera and upwards shakes, object relative departure optical center axle Z axle, move to X-direction, for supplying this shock momentum, this moment can be by 37 pairs two electromagnet 321 of controller, 323 impose different electric currents, as electromagnet 321 is imposed less electric current electromagnet 323 is imposed big electric current, or by 37 pairs of electromagnet 321 of controller, 323 impose the electric current of different directions respectively as electromagnet 321 is imposed anticlockwise electric current and electromagnet 323 is imposed clockwise electric current; Coil 31 will be subjected to magnetic field intensity influences different between two electromagnet 321,323 this moment, cause and produce unbalanced stress, make the optical axis of camera lens 2 be subjected to force direction to produce a deviation angle θ at this relatively, and make camera lens 2, reach the purpose of anti-hand shake towards object.The electromagnetic core 36 of the electromagnet 321～324 of present embodiment use can use iron-nickel alloy (Permalloys) to make again, the iron-nickel alloy magnetic conductivity low and have the height electromagnetic susceptibility, when electromagnet 321～324 is passed to the electric current of Fast transforms, can react electromagnetic force fast, be beneficial to the electromagnetic force size of independent each electromagnet of control.

A plurality of electromagnet 32 of present embodiment lens driving mechanism 3 further can be located at upper limb face 312 tops of coil 31 again, make tail end section 361 magnetic force direction that produces of this electromagnetic core 36 can be downward vertically towards the upper limb face 312 of coil 31, just this electromagnetic force direction is the central shaft Z that is parallel to lens sleeve 22 (camera lens 2), causes the driving force that camera lens 2 is produced can be identical with the axially displaced direction of camera lens 2.Wherein, plural number is meant two or more, also is like this below.

＜the second embodiment 〉

Shown in figure 6,7,8, the lens driving mechanism 3 of the use electromagnet of present embodiment comprises: a coil 31, a plurality of electromagnet 32, present embodiment is for using four electromagnet 32.Wherein, this coil 31 is sheathed to be fixed on the lens sleeve 22 and the ring body of coil 31 forms a flanged structure that outwards protrudes relatively shown in Fig. 6,7 on the ring periphery of lens sleeve 22, and just coil 31 can be designed to the lower edge face 311 of flat and wide shape with relative formation one suitable radial width; These four electromagnet 32 are to be arranged at lower edge face 311 places near this coil 31 with equal angles (as 90 degree) spacing arrangement, and the electromagnetic core 36 of each electromagnet 32 has a long arc shape section 362 with the arc with respect to coil 31 lower edge faces 311, and long arc shape section 362 ends of electromagnetic core 36 are that corner forms a short vertical section 363 so that its tail end section 364 can be vertically upward towards the lower edge face 311 of coil 31; But and the more magnet coil number of turn of length winding of the long arc shape section 362 by electromagnetic core 36, just but this long arc shape section 362 can increase its annular length for the more magnet coil number of turn of winding in limited radial width, therefore after electromagnet 32 (321～324) energising, can strengthen the electromagnetic force that its tail end section 364 is produced, increase the driving force of camera lens 2 relatively, help the miniaturization of camera lens module 1, especially can reduce the diameter of camera lens module 1; The tail end section 364 of this electromagnetic core 36 is vertically upward towards the lower edge face 311 of coil 31 again, after electromagnet 32 energisings, tail end section 364 magnetic direction that produces of this electromagnetic core 36 lower edge face 311 of vertical plane that can make progress to coil 31, just this magnetic direction is perpendicular to the direction of current of coil 31, thereby generation is parallel to the acting force of the central shaft Z of lens sleeve 22 (camera lens 2), cause the driving force that camera lens 2 is produced can be identical, can promote the driving efficient of camera lens relatively with the axially displaced direction of camera lens 2.

The spring 38 that present embodiment uses be the coil spring made from spring steel and can be extension formula spring and be arranged in lens sleeve 22 and lower cover 12 between, when the driving force that is subjected to making progress after coil 31 passes to electric current moves, to drive lens sleeve 22 (camera lens 2) and move up, produce distortion with extension spring 38 this moment; After coil 31 cut off electric current, upwards electromagnetic force disappeared, and spring 38 is no longer stretched and reinstatement, will spur camera lens 2 homings.

The lens driving mechanism 3 of present embodiment further can be designed to the magnetic force size of independent each electromagnet 32 of control, impose the electric current of different directions/size respectively by 37 pairs of electromagnet of controller 321,323, make the optical axis of camera lens 2 be subjected to force direction to produce a deviation angle θ at this relatively, and make camera lens 2 towards object, as Fig. 9, reach the purpose of anti-hand shake.

A plurality of electromagnet 32 of the lens driving mechanism 3 of present embodiment further can be located at upper limb face 312 tops of coil 31 again, just make this vertical section 363 make to face the upper limb face 312 of coil 31 into downwards, make tail end section 364 magnetic direction that produces of electromagnetic core 36 can be downward vertically towards the upper limb face 312 of coil 31, just this electromagnetic force direction is the central shaft Z that is parallel to lens sleeve 22 (camera lens 2), causes the driving force that camera lens 2 is produced can be identical with the axially displaced direction of camera lens 2.

＜the three embodiment 〉

Shown in Figure 10,11, the lens driving mechanism 3 of the use electromagnet of present embodiment comprises: a coil 31, a plurality of electromagnet 32; Wherein, these several electromagnet 32 (321～324) are to be arranged at outer edge surface 313 places near this coil 31 with equal angles 90 degree spacing arrangement (being with equal angles 120 degree spacing arrangement during three electromagnet 32), wherein, for reaching optimum efficiency, this coil 31 can be designed to long and narrow shape.The electromagnetic core 36 of each electromagnet 32 (321～324) has a long arc shape section 365 with the arc with respect to the outer edge surface 312 of coil 31 ring bodies, use and reduce the electromagnet area occupied, and long arc shape section 365 ends of electromagnetic core 36 are that corner forms a short radial section 366, so that its tail end section 367 changes into radial direction with the outer edge surface 312 of vertical plane to coil 31 by tangential direction; But and the more magnet coil number of turn of length winding of the long arc shape section 365 by electromagnetic core 36, just but this long arc shape section 365 can increase its annular length for the more magnet coil number of turn of winding in limited radial width, therefore after switching on, electromagnet 32 (321～324) can strengthen magnetic field that its tail end section 367 produced direction of current perpendicular to coil 31, increase the driving force of camera lens 2 relatively, help the miniaturization of camera lens module 1, especially can reduce the height of camera lens module 1, and promote the driving efficient of camera lens 2.

The spring 38 that present embodiment uses is coil springs made from spring steel and is arranged between lens sleeve 22 and the loam cake 11 as the compression spring, when the strength that is subjected to making progress after coil 31 passes to electric current moves, to drive lens sleeve 22 (camera lens 2) and move up, will compress this spring 38 this moment and produce distortion; After coil 31 cut off electric currents, upwards electromagnetic force disappeared, and spring 38 no longer by compression and reinstatement will promote camera lens 2 homings.

A plurality of electromagnet 32 of the lens driving mechanism 3 of the use electromagnet of present embodiment further can be located at the inner edge surface of coil 31 again, just make this radial section 366 make to face from inside to outside the inner edge surface (not shown) of coil 31 into, also have the effect of the height that reduces camera lens module 1.

The lens driving mechanism 3 of the use electromagnet of present embodiment further can be designed to the magnetic field intensity of independent each electromagnet 32 of control, it is respectively to enter each electromagnet 32 (321～324) with the electric current of output different directions or size via four electromagnet electrodes 35 (351～354) by controller 37, makes the different magnetic force that can produce the N utmost points or the S utmost point in the tail end section 364 of the electromagnetic core 36 of each electromagnet 32 (321～324); As shown in figure 12, two electromagnet 321,323 are laid in the relative position of 180 degree at interval relatively, when the user holds camera and upwards shakes, object relative departure optical center axle Z axle, move to X-direction, for supplying this shock momentum, this moment can be by 37 pairs two electromagnet 321 of controller, 323 impose different electric currents, as electromagnet 321 is imposed less electric current electromagnet 323 is imposed big electric current, or by 37 pairs of electromagnet 321 of controller, 323 impose the electric current of different directions respectively as electromagnet 321 is imposed anticlockwise electric current and electromagnet 323 is imposed clockwise electric current; Coil 31 will be subjected to different electromagnetic force between two electromagnet 321,323 this moment, cause and produce unbalanced stress, make the optical axis of camera lens 2 be subjected to force direction to produce a deviation angle θ at this relatively, and make camera lens 2 towards object, reach the purpose of anti-hand shake.The electromagnetic core 36 of the electromagnet 321～324 of present embodiment use can use iron-nickel alloy to make again.

Structural design of the present invention has following advantage compared with the prior art at least:

＜1 〉, the lens driving mechanism 3 of use electromagnet of the present invention is to utilize electromagnet replacing permanent magnet, can the high temperature of anti-the reflow, can improve the possibility of mass production.

＜2 〉, lens driving mechanism 3 as first embodiment and second embodiment of use electromagnet of the present invention, it is to utilize several electromagnet to be arranged at the lower edge face place (or upper limb face place) of close this coil with the equal angles spacing arrangement, make the cylindricality electromagnetic core of each electromagnet be positioned at the below (or top of upper limb face) of the lower edge face of coil, and the magnetic force direction that tail end section produces of each electromagnetic core is the direction of current of (or downwards) vertical plane to coil that make progress, and generation is parallel to the acting force of the central shaft Z of lens sleeve, so the miniaturization that helps camera lens module reduces the diameter of camera lens module and the driving efficient that can promote camera lens.

＜3 〉, the lens driving mechanism 3 as the 3rd embodiment of use electromagnet of the present invention, it is to utilize several electromagnet to be arranged at the outer edge surface place (or inner edge surface place) of close this coil with the equal angles spacing arrangement, make the cylindricality electromagnetic core of each electromagnet be positioned at the outer edge surface (or inner edge surface) of coil, and the magnetic force direction that tail end section produces of each electromagnetic core be radially vertical plane to the direction of current of coil, and generation is parallel to the acting force of the central shaft Z of lens sleeve, help the miniaturization of camera lens module so can reduce the height of camera lens module, and the driving efficient that can promote camera lens.

＜4 〉, lens driving mechanism 3 as second embodiment and the 3rd embodiment of use electromagnet of the present invention, the electromagnetic core of its each electromagnet comprises a long arc shape section and a short vertical section (second embodiment) or short radial section (the 3rd embodiment), make the enough magnet coil numbers of turn of this long arc shape Duan Shangke winding so that its tail end section can produce enough magnetic field, so help promoting the driving efficient of camera lens.

＜5 〉, the lens driving mechanism 3 of use electromagnet of the present invention can independently control the magnetic field that each electromagnet 32 is produced, and makes it can reach anti-hand shake function.

The above only is preferred embodiment of the present invention, only is illustrative for the purpose of the present invention, and nonrestrictive; Those skilled in the art is understood, and can carry out many changes to it in the spirit and scope that claim of the present invention limited, revise, even the equivalence change, but all will fall within the scope of protection of the present invention.

Claims (11)

1, a kind of lens driving mechanism that uses electromagnet, its be applied to one automatically in the camera lens module of focusing or zoom in order to drive camera lens in the cavity volume of camera lens module along the central axis direction transitional slide, comprise a coil and several electromagnet, wherein:

Described coil is sheathed be fixed on the lens sleeve of this camera lens with the same moved further of camera lens;

Described electromagnet is arranged near this coil with the equal angles spacing arrangement and is positioned at the below of lower edge face of this coil or the top of upper limb face, and be maintained fixed motionlessly in camera lens module, and the tail end section of the electromagnetic core of each electromagnet is the direction of current that vertically is intended for this coil;

Wherein, behind coil and several electromagnet difference input current, but the electromagnetic force and the electromagnetic action force direction that are produced between mat coil and each electromagnet produce the acting force that is parallel to driving optical center axle, to drive camera lens in the enterprising line slip displacement of central axis direction.

2, the lens driving mechanism of use electromagnet according to claim 1, wherein the iron core of this electromagnet is to form a long arc shape section with lower edge face or upper limb face with respect to coil, and vertical peripheral surface of this long arc shape section for the winding magnet coil so that the length of iron core to lower edge face or the upper limb face of cross section vertical plane to coil.

3, the lens driving mechanism of use electromagnet according to claim 1, wherein the iron core of this electromagnet has a long arc shape section with respect to coil lower edge face or upper limb face, and the terminal corner of the long arc shape section of iron core forms one and lacks vertical section so that the tail end section of this weak point vertical section vertically is intended for the lower edge face or the upper limb face of coil, wherein the length of this long arc shape section face confession to the periphery winding magnet coil.

4, the lens driving mechanism of use electromagnet according to claim 1, wherein to be driven advancing of transitional slide or to retreat on central axis direction be that direction of current by input coil is controlled to this camera lens.

5, the lens driving mechanism of use electromagnet according to claim 1, wherein these several electromagnet further can impose the electric current of different sizes or direction, use the angle between the central shaft of controls lens optical axis and camera lens module.

6, the lens driving mechanism of use electromagnet according to claim 1, it further can dispose a spring on camera lens, and when the electromagnetic force between coil and the electromagnet disappeared, this spring can provide restoring force so that camera lens returns back to original position to camera lens.

7, a kind of lens driving mechanism that uses electromagnet, its be applied to one automatically in the camera lens module of focusing or zoom in order to drive camera lens in the cavity volume of camera lens module along the central axis direction transitional slide, comprise a coil and several electromagnet, wherein:

Described coil be on the sheathed lens sleeve that is fixed in this camera lens with the same moved further of camera lens;

It is to be arranged near this coil and to be positioned at the foreign side of outer edge surface of this coil or the side of inner edge surface with the equal angles spacing arrangement for described electromagnet, and be maintained fixed motionlessly in camera lens module, and the tail end section of the electromagnetic core of each electromagnet is the direction of current that vertically is intended for this coil;

Wherein, behind coil and several electromagnet difference input current, but the electromagnetic force and the electromagnetic action force direction that are produced between mat coil and each electromagnet produce the acting force that is parallel to driving optical center axle, to drive camera lens in the enterprising line slip displacement of central axis direction.

8, the lens driving mechanism of use electromagnet according to claim 7, wherein the iron core of this electromagnet is to form a long arc shape section with respect to coil outer edge surface or inner edge surface, and the terminal corner of the long arc shape section of iron core forms one and lacks radial section so that the tail end section of this weak point radial section vertically is intended for the lower edge face or the upper limb face of coil, wherein the length of this long arc shape section face confession to the periphery winding magnet coil.

9, the lens driving mechanism of use electromagnet according to claim 7, wherein to be driven advancing of transitional slide or to retreat on central axis direction be that direction of current by input coil is controlled to this camera lens.

10, according to the lens driving mechanism of the described use electromagnet of claim 7, wherein these several electromagnet further can impose the electric current of different sizes or direction, use the angle between the central shaft of controls lens optical axis and camera lens module.

11, according to the lens driving mechanism of the described use electromagnet of claim 6, it further can dispose a spring on camera lens, and when the electromagnetic force between coil and the electromagnet disappeared, this spring can provide restoring force so that camera lens returns back to original position to camera lens.

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