CN102549470A - Lens drive device - Google Patents
Lens drive device Download PDFInfo
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- CN102549470A CN102549470A CN2010800364807A CN201080036480A CN102549470A CN 102549470 A CN102549470 A CN 102549470A CN 2010800364807 A CN2010800364807 A CN 2010800364807A CN 201080036480 A CN201080036480 A CN 201080036480A CN 102549470 A CN102549470 A CN 102549470A
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- yoke
- lens
- lens driver
- wall portions
- outside wall
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
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- Optics & Photonics (AREA)
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Abstract
A lens drive device configured in such a manner that the device body has a small outer shape and that the lens drive device generates a driving force which can appropriately move the lens holder. A lens drive device is provided with a lens holder (3) by which the lens is held and a lens drive mechanism which moves the lens holder (3) in the optical axis direction. The lens drive mechanism is provided with: an annular hollow core coil (5) which is disposed around the lens holder (3); a yoke (6) which is provided with outer wall sections (66a-66d) facing the outer peripheral surface of the hollow core coil (5), and also with downwardly extending wall surfaces (63a-63d) arranged so as to be spaced from each other in the circumferential direction and facing the inner peripheral surface of the hollow core coil (5); and magnets (4a-4d) which are disposed between the hollow core coil (5) and the outer wall sections (66a-66d) of the yoke (6) with magnetic pole surfaces of the magnets facing the downwardly extending wall surfaces (63a-63d) of the yoke (6). The thickness of connecting sections (67a-67d) for connecting the outer wall sections (66a-66d) and the downwardly extending wall surfaces (63a-63d) of the yoke (6) is set to be greater than that of the outer wall sections (66a-66d) and the downwardly extending wall surfaces (63a-63d) of the yoke (6).
Description
Technical field
The present invention relates to lens driver, particularly relate to the lens driver of autofocus mechanism of being applicable to digital camera etc.
Background technology
In the past, in the lens driver that uses in the known autofocus mechanism at digital camera etc., made the lens carrier that keeps lens move (for example, with reference to patent documentation 1) along optical axis direction through the lens actuating device that constitutes by magnet, coil and yoke.In this lens driver, form magnetic circuit by yoke and magnet, through the electromagnetic force that produces to coil electricity lens carrier is moved on optical axis direction.Under this situation, constitute below adopting, that is: induce by yoke from the magnetic field of magnet and, get back to magnet once more through yoke through coil.
The prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2008-52196 communique
Brief summary of the invention
The problem that the present invention will solve
Yet, in recent years, in the lens driver of above-mentioned that kind, need the miniaturization of the profile of apparatus main body, on the other hand, need the maximization of lens-shape along with the high performance (high pixelation) of camera, and need to enlarge its installing space.For the needs of the installing space that satisfies these type of lens, can consider that footpath at lens upwards makes the size attenuation of yoke.But, in this case,, the magnetic circuit that forms in yoke causes that magnetic flux density becomes the situation of state of saturation owing to narrowing down, appearance can not be guaranteed the problem of the driving force of removable lens carrier.
Summary of the invention
The present invention is in view of this problem and making, and its objective is provides a kind of lens driver, can be maintained the driving force that obtains removable lens carrier in small-sized in the profile with apparatus main body.
The means that are used to deal with problems
Lens driver of the present invention is characterized in that, possesses: lens carrier, and it keeps lens; And lens actuating device, it moves said lens carrier on optical axis direction, and said lens actuating device has: the air core coil of ring-type, it is configuration around said lens carrier; Yoke, it has with the opposed outside wall portions of the outer peripheral face of said air core coil with the inner peripheral surface of said air core coil and is upwards leaving the opposed inner wall part in compartment of terrain week; And magnet; Between the outside wall portions of said air core coil and said yoke, dispose; And make the inner wall part of its pole surface and said yoke opposed, make the gauge of linking part of the outside wall portions that links said yoke and inner wall part thicker than the outside wall portions and the inner wall part of said yoke.
According to said lens driver; Owing to make the outside wall portions of the yoke that constitutes lens driver thicker than the outside wall portions and the inner wall part of this yoke with the gauge of the linking part of inner wall part binding; Even the outside wall portions of the yoke that therefore makes progress when the footpath that be configured in lens and inner wall part are relatively under the situation than the unfertile land formation; The magnetic circuit that in the linking part of flux concentrating, forms is broadened; Therefore and can avoid the magnetic saturation of yoke, a kind of lens driver can be provided, can be maintained the driving force that obtains removable lens carrier in small-sized in profile with apparatus main body.
In other words, because the pole surface of the outside wall portions of yoke and inner wall part and magnet is opposed, therefore accept from the magnetic flux of pole surface outflow or inflow with the plane.Therefore, if outside wall portions and inner wall part have certain thickness, then can accept magnetic flux fully.On the other hand, linking part must make the flux flow of its acceptance, if the thickness identical with the thickness of outside wall portions and inner wall part then can not flow magnetic flux, the result produces flux leakage.In the present invention, thicker through the thickness that makes linking part than outside wall portions and inner wall part, can under the state of the lens size radially of holdout device main body, suppress leakage of magnetic flux, its result can increase the driving force that lens carrier is moved.
In said lens driver, preferably, dispose a plurality of said magnet at inner wall part opposed position place with said yoke.Under this situation; Dispose a plurality of magnet owing to be limited to the part that helps to produce the driving force that the lens carrier that makes yoke moves; Therefore can produce the driving force that lens carrier is moved with minimal magnet; Therefore can reduce the fee of material of magnet, its result can reduce the manufacturing cost of lens driver.
In said lens driver, preferably, the outside wall portions of said yoke has rectangular shape, and the inner wall part of said magnet and said yoke disposes corresponding to four bights of this yoke.Under this situation; Because in the yoke of rectangular shape; With four bights that are easy to become dead angle (dead space) distributed magnet etc. accordingly, therefore a kind of lens driver can be provided, can effectively apply flexibly the space in the lens driver and obtain driving force that lens carrier is moved.
In said lens driver, preferably, the linking part of said yoke is configured in the front side and the rear side of moving direction of the said lens carrier of said air core coil.Under this situation,, therefore can make the magnetic circuit that in linking part, forms wideer, and can further increase the driving force that lens carrier is moved owing to 2 directions of the linking part that can make yoke from air core coil dispose opposed to each other.
In said lens driver; Preferably; By with pull and stretch processing (Japanese: strand り processing) outside wall portions of said yoke and inner wall part are processed as thinner, and make the gauge of this linking part thicker than the outside wall portions and the inner wall part of said yoke than the linking part of said yoke.Under this situation, the magnetic circuit that forms in the linking part of flux concentrating in single yoke is broadened, and can avoid the magnetic saturation of yoke, therefore can reduce the component parts of lens driver, but the formation of simplification device.
In said lens driver, preferably, overlapping auxiliary yoke on said yoke and make the gauge of linking part of said yoke thicker than the outside wall portions and the inner wall part of said yoke.Under this situation; Auxiliary yoke through overlapping on the yoke constitutes the part of linking part, thereby in manufacture process, need the part of yoke not formed thicker, thereby can reduce the manufacturing cost of yoke; Its result can reduce the manufacturing cost of lens driver.
For example, in the said lens drive unit, can consider overlapping single said auxiliary yoke on said yoke.Under this situation; Only through single auxiliary yoke overlapping gauge of linking part that just can make on yoke is thicker than the outside wall portions and the inner wall part of yoke; Therefore can yoke not carried out special processing and the magnetic circuit that in linking part, forms is broadened, can avoid the magnetic saturation of yoke.
In addition, in said lens driver, preferably, in the overlap a plurality of said auxiliary yokes corresponding of said yoke with said magnet.Under this situation; Dispose a plurality of auxiliary magnets owing to be limited to the part that helps to produce the driving force that the lens carrier that makes yoke moves; Therefore can avoid magnetic saturation with minimal auxiliary magnet; Therefore can reduce the fee of material of auxiliary magnet, its result can reduce the manufacturing cost of lens driver.
In addition, in said lens driver, preferably, the air core coil of said ring-type is constituted octagon or makes the cardinal principle octagon of the linearize of circular arc portion everywhere of circular shape.In this case, the air core coil of ring-type is constituted octagon or octagon substantially, therefore, for example, the situation that has toroidal with air core coil is compared the peristome that can enlarge central authorities, and the installing space of the lens that therefore can guarantee to be kept by lens carrier is bigger.
The effect of invention
According to the present invention; Owing to establish the outside wall portions of the yoke that constitutes lens driver thicker than the outside wall portions and the inner wall part of this yoke with the gauge of the linking part of inner wall part binding; Even the outside wall portions of the yoke that therefore makes progress when the footpath that be configured in lens and inner wall part are relatively under the situation than the unfertile land formation; The magnetic circuit that in the linking part of flux concentrating, forms is broadened; Therefore can avoid the magnetic saturation of yoke, a kind of lens driver can be provided, can be maintained the driving force that obtains removable lens carrier in small-sized in profile with apparatus main body.
Description of drawings
Fig. 1 is the exploded perspective view of the lens driver that relates to of embodiment 1 of the present invention.
Fig. 2 is the stereographic map under the situation after the lens driver that embodiment 1 relates to is assembled.
Fig. 3 is the stereographic map around the lens drive division that has of lens driver that embodiment 1 relates to.
Fig. 4 is the stereographic map of the lens driver that relates to of the variation of embodiment 1.
Fig. 5 is the stereographic map under the situation after the lens driver that embodiment 2 of the present invention relates to is assembled.
Fig. 6 be the yoke that has of lens driver that embodiment 2 relates to around exploded perspective view.
Fig. 7 is the stereographic map of the lens driver that relates to of the variation of embodiment 2.
Embodiment
Specify embodiment of the present invention with reference to the accompanying drawings.
(embodiment 1)
Fig. 1 is the exploded perspective view of the lens driver 1 that relates to of embodiment 1 of the present invention.As shown in Figure 1, the formation of the lens driver 1 that embodiment 1 relates to comprises: the base component 2 of the bottom surface sections of constituent apparatus; The lens carrier 3 that keeps not shown lens; Constitute the magnet 4a～4d, the air core coil (being designated hereinafter simply as " coil ") 5 and yoke 6 that make this lens carrier 3 mobile lens actuating device on optical axis direction; Lens carrier 3 flexibly is fixed on a pair of laminated spring (lower side panel spring 7, epipleural spring 8) on base component 2 and the yoke 6; Top cover 9 in the configuration of the upper surface of yoke 6; Cover 10 with the upper surface that covers this top cover 9.
At base component 2, will have sheet metal 11 insert moulding under the state that its part is exposed of reservation shape.This sheet metal 11 has: partly outstanding fixed part 111a～111d (among Fig. 1, fixed part 111d is not shown) from the below of tabling piece 22a～22d; With near fixed part 111b, 111d from the side surface part of base component 2 to side outstanding and bent and the ground lug 111e, the 111f that extend of lateral bending downwards.This sheet metal 11 is implemented to implement the good metal material of gold-plated solder such as stainless steel (Japanese: れ is moistened in half field) property again after the nickel plating by packfong for example, phosphor bronze as bottom and is constituted, and plays through lower side panel spring 7 and the function of the outside terminal of the substrate of function that is electrically connected with coil 5 and conduct and lens mounting drive unit 1 etc.
Yoke 6 forms through magnetic materials such as metal are carried out machining, has the box shape at lower side opening shown in Figure 1.In addition, yoke 6 is made as rectangular shape substantially, and the centre is provided with the peristome 61 of toroidal therein.At four jiaos end portion of yoke 6, be provided with slightly to the outstanding stator 62a～62d (in Fig. 1, stator 62d is not shown) of side.The physical dimension of this stator 62a～62d is arranged to, and is consistent with the physical dimension of the fixed part 111a～111d of outstanding sheet metal 11 from four angle parts of base component 2.In addition, the position corresponding with four angle parts of yoke 6 at the circumference of peristome 61 is provided with the wall 63a～63d that hangs down (in Fig. 1, the wall 63b that hangs down is not shown) with hanging down.This wall 63a～63d that hangs down is as the inner wall part performance function of yoke 6, under the state that contains lens carrier 3, is configured between the inner peripheral surface of outer peripheral face and coil 5 of lens carrier 3.Have again,, be provided with recess 64a～64d of the protrusion tab 33a～33d that can accommodate lens carrier 3 in the position between wall 63a～63d of hanging down of the circumference of peristome 61.And, in the side of this recess 64a～64d, be provided with slightly a pair of butt sheet 65a～65d side-prominent in peristome 61.
Lower side panel spring 7 for example is made up of conductive materials such as phosphor bronzes, has: at four fixing outside fixed parts 71 of base component 2; At the fixing pair of inside fixed part 72 of the lower surface of lens carrier 3; With four arms 73 that will this outside fixed part 71 link with inboard fixed part 72.The precalculated position of fixed part 71 in the outside is provided with a plurality of hole 71a, inserts at the spacer 23a～23d of base component 2 and wears under the state of this hole 71a, and lower side panel spring 7 is fixing at base component 2.In addition,, be provided with a plurality of hole 72a, insert at the stator of the lower surface that is arranged at lens carrier 3 and wear under the state of this hole 72a, lower side panel spring 7 is fixed on the lens carrier 3 in the precalculated position of inboard fixed part 72.Arm 73 repeatedly turns back from the position of the outside fixed part 71 corresponding with four angle parts of base component 2 and links with inboard fixed part 72.
Top cover 9 is for example overlapping and constitute with metal light sheet material, has the annular shape identical substantially with the outside fixed part 81 of epipleural spring 8.Precalculated position at the lower surface of top cover 9 is provided with side-prominent fixed pin downwards, and they are being inserted under the state of the hole 81a that puts on side plate spring 8, and is fixing on yoke 6.Under the top cover that will possess this type of formation 9 overlapping a plurality of states, can easily increase the outside wall portions 66a～66d of the yoke of stating after the binding 6 and the thickness of linking part 67a～67d of the wall 63a～63d that hangs down.
When assembling has the lens driver 1 of this type of formation; The lens carrier 3 that will maintain via lower side panel spring 7 under the state of coil 5 is fixed on the base component 2; And the yoke 6 that will be fixed with magnet 4a～4d at the internal face of four angle parts is fixing at base component 2, so that lens carrier 3 is configured in the inboard of peristome 61.And, load epipleural spring 8 at the upper surface of lens carrier 3 and yoke 6, so that accommodate the spacer 34a～34d of lens carrier 3 through notch 82a.Then, top cover 9 is fixed at the upper surface of yoke 6, so that the fixed pin of top cover 9 is inserted the hole 81a that puts on side plate spring 8.Then, at the upper surface fixed cap parts 10 of top cover 9.Like this, the assembling operation of lens driver 1 finishes, and the lens driver 1 of state shown in Figure 2 is accomplished.Fig. 2 is the stereographic map under the situation after the lens driver that embodiment 1 relates to is assembled.Have again, in Fig. 2,, represented the bight of lens driver 1 and the section of side surface part for ease of explanation.
Have, at base component 2 fixedly the time, yoke 6 is capped so that the tabling piece 22a～22d of base component 2 is chimeric with the inwall of four angle parts of yoke 6 respectively again.At this moment, as shown in Figure 2, the stator 62a～62d of yoke 6 becomes at overlapping state on the fixed part 111a～111d of the outstanding sheet metal 11 in four angle parts of base component 2.And, through with this stator 62a～62d and fixed part 111a～111d with engaging on base component 2 fixing yoke 6.
Under the state after assembled as above-mentioned, as shown in Figure 2, lens driver 1 has lens carrier 3 in the internal configurations of the peristome 101 of cover 10.Lens carrier 3 is fixed on base component 2 through lower side panel spring 7, and is fixing in yoke 6 through epipleural spring 8 on the other hand, and becomes the state that remains on primary position through the acting force of this epipleural spring 8 and lower side panel spring 7.Not shown lens are assembled through screwing in this lens carrier 3 from upper side shown in Figure 2, constitute and can move with these lens carrier 3 one.
When electric current flows in the coil 5 that the outer peripheral face by lens carrier 3 keeps; Electric current that in coil 5, flows and the action of a magnetic field that produces from magnet 4a～4d make coil 5 go up the driving force (thrust) that moves at above-below direction shown in Figure 2 (optical axis direction) thereby produce.In the lens driver 1 that this embodiment relates to; For example, be controlled at coil 5 current amount flowing according to indicating, thereby control its driving force from the driving of the control part of the mobile phone of loading device main body or digital camera; Coil 5 is moved up and down, carry out its location.Like this, the location of the lens carrier 3 of coil 5 can be maintained, and the location of the lens of installation on lens carrier 3 can be carried out.
The formation of the yoke 6 that the lens driver 1 that here, embodiment 1 is related to is had describes.As shown in Figure 2; In yoke 6; The outside wall portions of wall 63a～63d and the part that magnet 4a～4d is fixing of hanging down (promptly; The outside wall portions corresponding with four bights) 66a～66d (in Fig. 2, only representing outside wall portions 66a) links (in Fig. 2, only representing linking part 67a) by linking part 67a～67d in the end above that.And, in yoke 6, the thickness of this linking part 67a～67d is constituted than is hung down wall 63a～63d and outside wall portions 66a～66d is thick.Like this, in lens driver 1, through making hang down wall 63a～63d and outside wall portions 66a～66d of linking part 67a～67d ratio thick, and the magnetic circuit that forms in yoke 6 is broadened, can guarantee the driving force that lens carrier 3 is moved.
In the lens driver 1 that embodiment 1 relates to, for example, process through yoke 6 is implemented pull and stretch, and make the thickness of linking part 67a～67d constitute thicker than the outside wall portions 66a～66d and the wall 63a～63d that hangs down.Particularly; Through in the process of pull and stretch processing, processing hang down wall 63a～63d and the outside wall portions 66a～66d of yoke 6 thinner than linking part 67a～67d, thereby it is thick to constitute hang down wall 63a～63d and outside wall portions 66a～66d of the gauge ratio that makes linking part 67a～67d.Like this; In pull and stretch processing, make the thickness of linking part 67a～67d constitute than hang down under the thick situation of wall 63a～63d and outside wall portions 66a～66d; The magnetic circuit that forms in the linking part 67a～67d of flux concentrating in single yoke 6 is broadened; And can avoid the magnetic saturation of yoke 6, therefore can reduce the component parts of lens driver 1, but the formation of simplification device.Have again, constitute than hang down wall 63a～63d and the thick method of outside wall portions 66a～66d, be not limited to pull and stretch processing about the gauge that makes linking part 67a～67d.
Fig. 3 is the lens drive division that lens driver the had stereographic map on every side that embodiment 1 relates to.Have again, in Fig. 3,, omitted lens carrier 3, epipleural spring 8, top cover 9 and cover 10 for ease of explanation.As shown in Figure 3, under the state of the pole surface that magnet 4a～4d makes the N utmost point in the outside wall portions 66a～66d arranged opposite of pole surface that makes the S utmost point and yoke 6, on the other hand and the wall 63a～63d arranged opposite that hangs down, be fixed in four bights of yoke 6.Therefore as stated, coil 5 is configured in magnet 4a～4d and hangs down between wall 63a～63d, becomes the state of pole surface arranged opposite of the N utmost point of its peripheral part and magnet 4a～4d.
As shown in Figure 3, constitute below adopting, be directed into the wall 63a～63d that hangs down of yoke 6 from the magnetic field of magnet 4a～4d from the pole surface of the N utmost point, advance to outside wall portions 66a～66d through linking part 67a～67d, and get back to the pole surface of the S utmost point.In this case; When the linking part 67a～67d of yoke 6 has the gauge identical with outside wall portions 66a～66d with the wall 63a～63d that hangs down; Flux concentrating in the magnetic circuit that linking part 67a～67d forms, magnetic flux density becomes state of saturation in linking part 67a～67d, and magnetic field is to yoke 6 external leakages; Magnetic flux through coil 5 reduces, and the driving force that its result will cause lens carrier 3 is moved descends.In the lens driver 1 that embodiment 1 relates to; Through making linking part 67a～67d thicker than the outside wall portions 66a～66d and the wall 63a～63d that hangs down; Even under the situation that hang down wall 63a～63d and the outside wall portions 66a～66d of the yoke 6 that makes progress in the footpath that is disposed at lens constitute than unfertile land relatively; The magnetic circuit that in the linking part 67a～67d of flux concentrating, forms is broadened, can avoid the magnetic saturation of yoke 6.Like this, can prevent to make the decline of the driving force that lens carrier 3 moves, and can guarantee this driving force.
More specifically, the pole surface of hang down wall 63a～63d and the outside wall portions 66a～66d and the magnet 4a～4d of yoke 6 is opposed, therefore becomes with the plane to accept from the magnetic flux of pole surface outflow and inflow.Therefore, as long as hang down wall 63a～63d and outside wall portions 66a～66d have certain thickness, just can accept magnetic flux fully.On the other hand, linking part 67a～67d must flow through the magnetic flux of this acceptance, if with the identical thickness of thickness of hang down wall 63a～63d and outside wall portions 66a～66d, then can not flow magnetic flux, the result produces flux leakage.In the lens driver that the present invention relates to 1; Thick through hang down wall 63a～63d and outside wall portions 66a～66d of the thickness ratio that makes linking part 67a～67d; Can under the state of the lens size radially of holdout device main body, suppress leakage of magnetic flux; Its result can increase the driving force that lens carrier 3 is moved.
As stated; In the lens driver 1 that embodiment 1 relates to; Make hang down wall 63a～63d and outside wall portions 66a～66d of the gauge ratio of linking part 67a～67d that hang down wall 63a～63d and outside wall portions 66a～66d of the yoke 6 that will constitute lens actuating device link thick; Therefore; Even under the situation that hang down wall 63a～63d and the outside wall portions 66a～66d of the yoke 6 that the footpath that is disposed at lens is made progress constitute than unfertile land relatively, the magnetic circuit that in the linking part 67a～67d of flux concentrating, forms is broadened, can avoid the magnetic saturation of yoke 6; Therefore, can be maintained in profile and obtain driving force that lens carrier 3 is moved in small-sized apparatus main body.
Especially, in the lens driver 1 that embodiment 1 relates to, dispose a plurality of magnet 4a～4d at the wall 63a that hangs down～63d opposed position place with yoke 6.Under this situation; Dispose a plurality of magnet 4a～4d owing to be limited to the part that helps to produce the driving force that the lens carrier 3 that makes yoke 6 moves; Therefore can produce the driving force that lens carrier 3 is moved with minimal magnet 4; Therefore can reduce the fee of material of magnet 4, its result can reduce the manufacturing cost of lens driver 1.
Fig. 4 is the stereographic map of the lens driver that relates to of the variation of embodiment 1.Have again, in Fig. 4,, represented the bight of lens driver 12 and the section of side surface part for ease of explanation.In addition, in Fig. 4,, and omit its explanation for the identical identical mark of formation mark of the lens driver that relates to embodiment 11.
Lens driver 12 shown in Figure 4 is on the different this point of formation of yoke 6, and is different with the lens driver 1 that embodiment 1 relates to.The yoke 6 that lens driver 12 shown in Figure 4 is had will be through constituting with the second yoke 6b combination that has the shape of the closure of openings of the first yoke 6a at the first yoke 6a of lower side opening.Have, in lens driver shown in Figure 4 12, the support unit 13 etc. of the shape of base component 2 and supporting yoke 6 has the different formation of the drive unit that relates to embodiment 11, still, does not have direct correlation with the application's invention again.
In the first yoke 6a, the yoke 6 of the lens driver 1 that relates to embodiment 1 is same, has the wall of hanging down 63a～63d, outside wall portions 66a～66d and linking part 67a～67d.In addition, the gauge of linking part 67a～67d constitutes than hangs down wall 63a～63d and outside wall portions 66a～66d is thick.On the other hand, in the second yoke 6b, have: erect wall 68a～68d (in Fig. 4, only expression erects wall 68a) in the configuration of the lower side of the wall 63a～63d that hangs down; With the bottom surface sections 69a as the linking part performance function～69d (in Fig. 4, only representing bottom surface sections 69a) that this is erected wall 68a～68d and outside wall portions 66a～66d binding.The gauge of bottom surface sections 69a～69d constitutes than erects wall 68a～68d and outside wall portions 66a～66d is thick., for example same as the gauge that makes bottom surface sections 69a～69d with embodiment 1 than erecting wall 68a～68d and the thick method of outside wall portions 66a～66d, wait through pull and stretch processing and to realize.Have again, erect the inner wall part performance function of wall 68a～68d as yoke 6.
In lens driver 12; Formation is as shown in Figure 4 below adopting, and is induced into the wall 63a～63d that hangs down of the first yoke 6a from the pole surface of the N utmost point from the magnetic field of magnet 4a～4d; Advance to outside wall portions 66a～66d via linking part 67a～67d; And get back to the pole surface of the S utmost point, on the other hand, erect wall 68a～68d from what the pole surface of the N utmost point was induced into the second yoke 6b from the magnetic field of magnet 4a～4d; Advance to outside wall portions 66a～66d via bottom surface sections 69a～69d, and get back to the pole surface of the S utmost point.In this case; In lens driver shown in Figure 4 12; Make hang down wall 63a～63d and outside wall portions 66a～66d of linking part 67a～67d ratio thick; And make that bottom surface sections 69a～the 69d ratio erects wall 68a～68d and outside wall portions 66a～66d is thick, therefore compare magnetic circuit is broadened, can further increase the driving force that lens carrier 3 is moved with the lens driver 1 that embodiment 1 relates to.
As stated; In lens driver shown in Figure 4 12; The front side of the moving direction of the lens carrier 3 that the linking part 67a～67d and the bottom surface sections 69a～69d of yoke 6 is configured in coil 5 and rear side are the upper side and the lower side of coil 5 shown in Figure 4; Therefore can be with the linking part 67a～67d of yoke 6 and bottom surface sections 69a～69d 2 direction arranged opposite from coil 5; Thereby can make the magnetic circuit that in linking part 67a～67d and bottom surface sections 69a～69d, forms wideer, can further increase the driving force that lens carrier 3 is moved.
(embodiment 2)
In the lens driver 1 that embodiment 1 relates to, through making the part corresponding form than hang down wall 63a～63d and the thick magnetic circuit that makes of outside wall portions 66a～66d broadens, and guarantee driving force that lens carrier 3 is moved with the linking part 67a～67d of yoke 6.In the lens driver 14 that embodiment 2 relates to; Making the linking part 67a～67d of yoke 6 be configured the thicker magnetic circuit that makes through overlapping auxiliary yoke 15 broadens; And guarantee driving force that lens carrier 3 is moved, in this, different with the lens driver 1 that embodiment 1 relates to.
Fig. 5 is the stereographic map of the lens driver 14 that relates to of embodiment 2 of the present invention.Fig. 6 be the yoke 6 that has of lens driver 14 that embodiment 2 relates to around the exploded perspective view of formation.Have again, in Fig. 5 and Fig. 6,, represented the bight of lens driver 14 and the section of side surface part for the ease of explanation.In addition, in Fig. 5 and Fig. 6,, and omit its explanation for the identical identical mark of formation mark of the lens driver that relates to embodiment 11.
As shown in Figure 5; In the lens driver 14 that embodiment 2 relates to; Be with lens driver 1 difference that embodiment 1 relates to: the linking part 67a～67d of yoke 6 be set at and hang down wall 63a～63d and the identical gauge of outside wall portions 66a～66d and auxiliary yoke 15 with the upper surface that overlaps this linking part 67a～67d.Have, constitute for other, the lens driver 1 that relates to embodiment 1 is identical.
As shown in Figure 6, auxiliary yoke 15 likewise forms through metal magnetic material is carried out machining with yoke 6, has the writing board shape that has the peristome 151 of toroidal in central authorities.Auxiliary yoke 15 has the profile identical substantially with the upper surface of yoke 6, for example, fixes at the upper surface of yoke 6 through bonding agent etc.That is, auxiliary yoke 15 is fixed at the upper surface of linking part 67a～67d, and is integrated and constitute the part of linking part 67a～67d with yoke 6.Have again,, be formed with recess 152a～152d (in Fig. 5, recess 152a is not shown) in the position corresponding of peristome 151 with the recess 64a～64d of yoke 6.This recess 152a～152d and recess 64a～64d are same, constitute the protrusion tab 33a～33d that can accommodate lens carrier 3.
As stated; In the lens driver 14 that embodiment 2 relates to; Possess in the fixing auxiliary yoke 15 of the upper surface of the linking part 67a～67d of yoke 6, through yoke 6 and the magnetic circuit that constitutes from the magnetic field of magnet 4a～4d with these yoke 6 incorporate auxiliary yokes 15.Under this situation; Lens driver 1 from magnetic field and the embodiment 1 of magnet 4a～4d relates to is same; Be induced to the wall 63a～63d that hangs down of yoke 6 from the pole surface of the N utmost point, via linking part 67a～67d and auxiliary yoke 15 and advance to outside wall portions 66a～66d, and get back to the pole surface of the S utmost point.Like this, the magnetic circuit from the part of the flux concentrating of magnet 4a～4d is broadened, therefore same with the lens driver 1 that embodiment 1 relates to, can guarantee the driving force that lens carrier 3 is moved.
Especially; In the lens driver 14 that embodiment 2 relates to, constitute yoke 6 and in the fixing auxiliary yoke 15 of the linking part 67a～67d of this yoke 6, therefore with miscellaneous part; The lens driver 1 that does not need to relate to like enforcement mode 1; Part with yoke 6 in manufacture process forms thicklyer (for example, need not form the linking part 67a～67d of yoke 6 thicker through pull and stretch processing etc.), thereby can reduce the manufacturing cost of yoke 6; Its result can reduce the manufacturing cost of lens driver 14.
In addition, in the lens driver 14 that embodiment 2 relates to, overlapping single (one) auxiliary yoke 15 on yoke 6, and make the part performance function of auxiliary yoke 15 as linking part 67a～67d.Like this, only through the magnetic circuit from the part of the flux concentrating of magnet 4a～4d being broadened with single auxiliary yoke 15 is overlapping on yoke 6, therefore can not carry out special processing and avoid the magnetic saturation of yoke 6 yoke 6.
Fig. 7 is the stereographic map of the lens driver 16 that relates to of the variation of embodiment 2.Have again, in Fig. 7,, represented the bight of lens driver 16 and the section of side surface part for the ease of explanation.In addition, in Fig. 7,, and omit its explanation for the identical identical mark of formations mark of the lens driver that relates to embodiment 2 14.
Lens driver 16 shown in Figure 7 is in the different this point of the formation of yoke 6 and have on a plurality of auxiliary yoke 15 this point, and is different with the lens driver 14 that embodiment 2 relates to.The yoke 6 that lens driver 16 shown in Figure 7 is had will be through constituting with the second yoke 6b combination that has the shape of the closure of openings of the first yoke 6a at the first yoke 6a of lower side opening.In addition, lens driver 16 shown in Figure 7 has first, second auxiliary yoke 15a, the 15b of the lower surface configuration of upper surface at this first yoke 6a, the second yoke 6b.Have, in lens driver shown in Figure 7 16, support unit 17 grades of the shape of base component 2 and supporting yoke 6 have the different formation of the lens driver that relates to embodiment 2 14, still, do not have direct correlation with the application's invention again.
In the first yoke 6a, the yoke 6 of the lens driver 14 that relates to embodiment 2 is same, has the wall of hanging down 63a～63d, outside wall portions 66a～66d and linking part 67a～67d.On the other hand; In the second yoke 2b; Have: erect wall 68a～68d (in Fig. 7 in the configuration of the lower side of the wall 63a～63d that hangs down; Only expression erects wall 68a) and this is erected the bottom surface sections 69a as the linking part performance function～69d (in Fig. 7, only representing bottom surface sections 69a) of wall 68a～68d and outside wall portions 66a～66d binding.
The auxiliary yoke 15 of the lens driver 14 that the first auxiliary yoke 15a and embodiment 2 relate to is same, fixes at the upper surface of linking part 67a～67d of the first yoke 6a, and is integrated with the first yoke 6a.On the other hand, the second yoke 15b fixes at the lower surface of bottom surface sections 69a～69d of the second yoke 6b, and is integrated and constitute the part of bottom surface sections 69a～69d with the second yoke 6b.Promptly; This first, second auxiliary yoke 15a, 15b fix at linking part 67a～67d of the first yoke 6a, bottom surface sections 69a～69d of the second yoke 6b respectively; Constitute the part of linking part 67a～67d or bottom surface sections 69a～69d, play the effect that the magnetic circuit that makes the first yoke 6a, the second yoke 6b broadens.
In lens driver 16; As shown in Figure 7; Be induced into the wall 63a～63d that hangs down of the first yoke 6a from the magnetic field of magnet 4a～4d from the pole surface of the N utmost point, via the linking part 67a～67d and the first auxiliary yoke 15 and advance to outside wall portions 66a～66d, and get back to the pole surface of the S utmost point; On the other hand; Erect wall 68a～68d from the magnetic field of magnet 4a～4d from what the pole surface of the N utmost point was induced into the second yoke 6b, via the bottom surface sections 69a～69d and the second auxiliary yoke 15b and advance to outside wall portions 66a～66d, and get back to the pole surface of the S utmost point.Under this situation; In lens driver shown in Figure 7 16; The first auxiliary yoke 15a is overlapped in linking part 67a～67d and the second auxiliary yoke 15b is overlapped in bottom surface sections 69a～69d; Therefore compare with the lens driver 14 that second embodiment relates to magnetic circuit is broadened, can further increase the driving force that lens carrier 3 is moved.
Have again, the invention is not restricted to above-mentioned embodiment, can carry out various variations and implement.In the above-described embodiment,, be not limited to this, can in the scope of performance effect of the present invention, suitably change for size shown in the drawings and shape etc.In addition, in the scope that does not break away from the object of the invention, can suitably change and implement.
For example, in the lens driver that above-mentioned embodiment relates to, situation about possessing at the fixing a plurality of magnet 4a～4d of four jiaos internal face of yoke 6 has been described, still, the formation for magnet 4 is not limited to this, can suitably change.Considering that the profile with apparatus main body is maintained on the small-sized basis, for example, also the single magnet of available ring-type constitutes.Under this situation, can omit magnet 4a～4d is separately fixed at operation on four jiaos the internal face of yoke 6 etc., the manufacturing process that therefore can simplify lens driver.
In addition, in above-mentioned embodiment 2, situation about possessing in the overlapping single auxiliary yoke 15 of the linking part 67a～67d of yoke 6 has been described, still, the formation for auxiliary yoke 15 is not limited to this, can suitably change.For example, from avoiding because of concentrated caused magnetically saturated viewpoint from the magnetic flux of magnet 4a～4d, can be only in the overlapping a plurality of auxiliary yokes 15 of the part corresponding of yoke 6 (promptly, corresponding part) with linking part 67a～67d with magnet 4a～4d.Under this situation; Be limited to the part that helps to produce the driving force that the lens carrier 3 that makes yoke 6 moves and dispose a plurality of auxiliary yokes 15; Therefore can minimal auxiliary yoke 15 avoid magnetic saturation; Thereby can reduce the fee of material of auxiliary yoke 15, its result can reduce the manufacturing cost of lens driver.
The application is based on the special 2009-190718 of hope of the Japan of submitting on August 20th, 2009.Its content is all incorporated into here.
Claims (9)
1. lens driver is characterized in that possessing:
Lens carrier keeps lens; With
Lens actuating device moves said lens carrier on optical axis direction,
Said lens actuating device has:
The air core coil of ring-type, configuration around said lens carrier;
Yoke has with the opposed outside wall portions of the outer peripheral face of said air core coil with the inner peripheral surface of said air core coil and is upwards leaving the opposed inner wall part in compartment of terrain week; With
Magnet disposes between the outside wall portions of said air core coil and said yoke, and makes the inner wall part of its pole surface and said yoke opposed,
Make the gauge of linking part of the outside wall portions that links said yoke and inner wall part thicker than the outside wall portions and the inner wall part of said yoke.
2. lens driver according to claim 1 is characterized in that,
Inner wall part opposed position place with said yoke disposes a plurality of said magnet.
3. lens driver according to claim 2 is characterized in that,
The outside wall portions of said yoke has rectangular shape, and the inner wall part of said magnet and said yoke disposes corresponding to four bights of this yoke.
4. according to each described lens driver in the claim 1 to 3, it is characterized in that,
The linking part of said yoke is configured in the front side and the rear side of moving direction of the said lens carrier of said air core coil.
5. according to each described lens driver in the claim 1 to 4, it is characterized in that,
Through pull and stretch processing the outside wall portions of said yoke and inner wall part are processed as thinner than the linking part of said yoke, thereby make the gauge of this linking part thicker than the outside wall portions and the inner wall part of said yoke.
6. according to each described lens driver in the claim 1 to 5, it is characterized in that,
Overlapping auxiliary yoke on said yoke and make the gauge of linking part of said yoke thicker than the outside wall portions and the inner wall part of said yoke.
7. lens driver according to claim 6 is characterized in that,
Overlapping single said auxiliary yoke on said yoke.
8. lens driver according to claim 6 is characterized in that,
The overlap a plurality of said auxiliary yokes corresponding in said yoke with said magnet.
9. according to each described lens driver in the claim 1 to 4, it is characterized in that,
The air core coil of said ring-type is constituted octagon or makes the cardinal principle octagon of the linearize of circular arc portion everywhere of circular shape.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-190718 | 2009-08-20 | ||
| JP2009190718 | 2009-08-20 | ||
| PCT/JP2010/062845 WO2011021489A1 (en) | 2009-08-20 | 2010-07-29 | Lens drive device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102549470A true CN102549470A (en) | 2012-07-04 |
Family
ID=43606944
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010800364807A Pending CN102549470A (en) | 2009-08-20 | 2010-07-29 | Lens drive device |
| CN2010202936155U Expired - Fee Related CN201780440U (en) | 2009-08-20 | 2010-08-13 | Lens driving device |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202936155U Expired - Fee Related CN201780440U (en) | 2009-08-20 | 2010-08-13 | Lens driving device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPWO2011021489A1 (en) |
| CN (2) | CN102549470A (en) |
| TW (1) | TW201140186A (en) |
| WO (1) | WO2011021489A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012242648A (en) * | 2011-05-20 | 2012-12-10 | Alps Electric Co Ltd | Lens drive device |
| CN112363294B (en) * | 2015-02-04 | 2022-10-11 | Lg伊诺特有限公司 | Lens driving device and camera module including the same |
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| JPH09204868A (en) * | 1996-01-29 | 1997-08-05 | Matsushita Electric Works Ltd | Breaker trip device |
| CN1831576A (en) * | 2005-03-11 | 2006-09-13 | 株式会社思考技研 | Lens drive apparatus |
| CN101114042A (en) * | 2006-07-26 | 2008-01-30 | 松下电器产业株式会社 | Lens actuator |
| JP2008026431A (en) * | 2006-07-19 | 2008-02-07 | Shicoh Eng Co Ltd | Lens drive device |
| CN101135763A (en) * | 2006-08-28 | 2008-03-05 | 阿尔卑斯电气株式会社 | Lens driving device |
| CN101246248A (en) * | 2007-02-14 | 2008-08-20 | 德昌电机股份有限公司 | Lens module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0689448A (en) * | 1992-09-07 | 1994-03-29 | Sharp Corp | Driving device for objective lens |
| JPH0935298A (en) * | 1995-07-11 | 1997-02-07 | Sony Corp | Biaxial actuator of optical pickup device |
| JP4882305B2 (en) * | 2004-08-13 | 2012-02-22 | ミツミ電機株式会社 | Autofocus actuator |
| JP2007072271A (en) * | 2005-09-08 | 2007-03-22 | Arima Device Kk | Lens driving device |
-
2010
- 2010-07-29 WO PCT/JP2010/062845 patent/WO2011021489A1/en active Application Filing
- 2010-07-29 JP JP2011527624A patent/JPWO2011021489A1/en active Pending
- 2010-07-29 CN CN2010800364807A patent/CN102549470A/en active Pending
- 2010-08-03 TW TW99125776A patent/TW201140186A/en unknown
- 2010-08-13 CN CN2010202936155U patent/CN201780440U/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09204868A (en) * | 1996-01-29 | 1997-08-05 | Matsushita Electric Works Ltd | Breaker trip device |
| CN1831576A (en) * | 2005-03-11 | 2006-09-13 | 株式会社思考技研 | Lens drive apparatus |
| JP2008026431A (en) * | 2006-07-19 | 2008-02-07 | Shicoh Eng Co Ltd | Lens drive device |
| CN101114042A (en) * | 2006-07-26 | 2008-01-30 | 松下电器产业株式会社 | Lens actuator |
| CN101135763A (en) * | 2006-08-28 | 2008-03-05 | 阿尔卑斯电气株式会社 | Lens driving device |
| CN101246248A (en) * | 2007-02-14 | 2008-08-20 | 德昌电机股份有限公司 | Lens module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN201780440U (en) | 2011-03-30 |
| TW201140186A (en) | 2011-11-16 |
| JPWO2011021489A1 (en) | 2013-01-24 |
| WO2011021489A1 (en) | 2011-02-24 |
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Application publication date: 20120704 |