CN101893748A - Lens driver, charging method and SMA assembly - Google Patents
Lens driver, charging method and SMA assembly Download PDFInfo
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- CN101893748A CN101893748A CN201010180980XA CN201010180980A CN101893748A CN 101893748 A CN101893748 A CN 101893748A CN 201010180980X A CN201010180980X A CN 201010180980XA CN 201010180980 A CN201010180980 A CN 201010180980A CN 101893748 A CN101893748 A CN 101893748A
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Abstract
The present invention relates to lens driver, charging method and SMA assembly.Problem of the present invention is easily to adjust the installation load that is applied on the shape memory allow wires.Lens driver (10) possesses: the lens mount (18) that comprises the cylindrical portion (182) that keeps lens barrel (11); Support of lens frame (18) makes the housing (14,16) that this lens mount can only move to optical axis (O) direction; Make lens mount (18) to travel mechanism that optical axis (O) direction moves; And guiding lens mount (18) guide that can only move to optical axis (O) direction.Travel mechanism comprises the shape memory allow wires (28) that is erected at the wire between lens mount (18) and the housing (14,16).Pack in a pair of hollow edged electrode (30) in the both ends of this shape memory allow wires (28).
Description
Technical field
The present invention relates to lens driver, relate in particular to the lens driver that in actuator, has used shape memory allow wires, the charging method of shape memory allow wires and the SMA assembly that is used for lens driver.
Background technology
The actuator that actuator of using as the automatic focus of camera and varifocal are used, known have (drive unit) linear actuator that has used marmem (Shape Memory Alloy:SMA).
For example, WO2007/113478A1 (patent documentation 1) discloses a kind of camera lens drive unit that the motion that utilizes the camera lens that a supporting structure (housing) supports by means of a suspension is driven.Patent documentation 1 disclosed camera lens drive unit is installed with the assembly with the SMA line that is connected with at least one boarded parts that carries on supporting structure., respectively to apply the acute angle that has along the tension force of the composition of optical axis at least two SMA lines are remained between camera lens parts and the supporting structure (housing) with having tension force with respect to optical axis.When optical axis is observed, keep two SMA lines at a certain angle.Sub-component has the installing component by the caulking SMA of connection line.Installing component is electrically connected with the SMA line.Therefore, installing component works as electrode.Installing component (electrode) is made of elongated sheet metal, is electrically connected with the end of SMA line by carrying out caulking to its leading section.
In addition, TOHKEMY 2007-292864 communique (patent documentation 2) discloses a kind of transmission efficiency that improved, and has realized the lens driver of miniaturization.These patent documentation 2 disclosed lens drivers have: fixed lens barrel (housing), part or all lens frame (lens mount), the support of lens frame (lens mount) of lens combination (lens barrel) that keep to constitute optical system make its with respect to fixed lens barrel along optical axis direction move freely guide and the side in optical axis direction to the boosting mechanism of lens frame reinforcing.Lens driver makes lens frame overcome the reinforcing of boosting mechanism and moves to the opposing party with respect to fixed lens barrel.
These patent documentation 2 disclosed lens drivers have marmem (SMA) line and bobbin holds parts.Its two ends of SMA line are fixed on the fixed lens barrel, its heating are compared the contraction in length of the relaxed state that is predetermined by utilizing energising.Shape memory allow wires is then returned the length of relaxed state when being cooled because of stopping to switch on.Bobbin holds parts and is arranged on the lens frame, and hook is set in the service portion between the two ends of shape memory allow wires, makes the forniciform direction of its protuberance towards an above-mentioned side thereby become.
In the embodiment of patent documentation 2 disclosed lens drivers, its two ends of SMA line are fixed on a pair of line support component, and a pair of line support component is fixed on the fixed lens barrel (housing).The energising control part is switched on by the two ends of a pair of line support component to the SMA line.Therefore, the line support component works as electrode, and line support component (electrode) is same with the installing component (electrode) of above-mentioned patent documentation 1, is made of elongated sheet metal.
Have, TOHKEMY 2007-78954 communique (patent documentation 3) discloses a kind of lens mirror body that uses marmem that imaging lens system is moved along optical axis direction that constitutes again.Patent documentation 3 disclosed lens mirror bodies have imaging lens system (lens barrel) that makes the subject photoimaging and the picture frame (lens mount) that keeps this imaging lens system (lens barrel), use the marmem that forms band shape that imaging lens system is moved along prescribed direction.The part of marmem is configured in the light path of imaging lens system (lens barrel), by utilizing energising marmem is shunk, thereby picture frame (lens mount) is moved.Patent documentation 3 also discloses the scheme that is provided with a pair of leaf spring of diaphragm type at the optical axis direction both ends of picture frame (lens mount) as the embodiment of lens mirror body.
In the embodiment of patent documentation 3 disclosed lens mirror bodies, will form the both ends of banded marmem, utilize a pair of plate member to be clamped to and erect on the cylindrical portion (housing) that is provided with from ground.By plate member marmem is switched on.Therefore, plate member works as electrode.
TOHKEMY 2009-19507 communique (patent documentation 4) discloses a kind of driver module and assemble method thereof, and it both can improve manufacturing efficient, can reduce the fluctuation of assembly precision again.These patent documentation 4 disclosed driver modules, it is arranged on base (housing movably; Supporter) driven member on (lens mount) fastening is according to the energising amount and the pars intermedia of flexible marmem (SMA) line.Driver module has a pair of maintenance terminal, base (housing; Supporter) has location division and fastening portion.Each keeps terminal to have: can distinguish conducting ground and keep the line maintaining part of the end of SMA line; The portion that is positioned of relative supporter; And be subjected to from supporter to the reacting force of the portion's of being positioned one side by fastening portion.The location division fastening keeps the portion that is positioned of terminal.Fastening portion towards the portion's of being positioned one side with pushing state fastening keep terminal by fastening portion.Because keeping terminal is conducting parts, thereby works as electrode.Keep terminal (electrode) to constitute the caulking online maintaining part in the end of SMA line by the plate-shaped member of key shape.
The problem that in above-mentioned patent documentation 1～4, has the following stated respectively.
In patent documentation 1 disclosed camera lens drive unit, the installing component of using as shape memory allow wires (electrode) uses elongated sheet metal.Therefore, adjust the installation that is applied on the shape memory allow wires loads very difficult.
In patent documentation 2 disclosed lens drivers, the also a pair of line support component (electrode) that elongated sheet metal is used as the SMA line.Therefore, adjust the installation that is applied on the SMA line loads very difficult.
In patent documentation 3 disclosed lens mirror bodies, also use a pair of plate member as electrode.Therefore, adjust the installation that is applied on the banded marmem loads very difficult.
In patent documentation 4 disclosed driver modules, a pair of maintenance terminal of using as the SMA line (electrode) uses the plate-shaped member of key shape.Therefore, adjust the installation that is applied on the SMA line loads very difficult.
In lens driver,, be very important thing to being applied to that installation load on the shape memory allow wires sets from viewpoints such as the amount of contraction of marmem parts, the shift amount of lens (stroke), permanance.
Summary of the invention
Therefore, problem of the present invention is to provide the charging method of a kind of lens driver that can easily adjust the installation load that is applied on the shape memory allow wires, shape memory allow wires and is used for the SMA assembly of lens driver.
Other purpose of the present invention will will be clearer and more definite along with following explanation.
According to first scheme of the present invention, can obtain following lens driver, this lens driver 10,10A possess: the lens mount 18 that comprises the cylindrical portion 182 that keeps lens barrel 11; Support of lens frame 18 makes the housing 12 that this lens mount can only move to optical axis O direction; Make lens mount 18 to travel mechanism that optical axis O direction moves; And guiding lens mount 18 guide that can only move to optical axis O direction, it is characterized in that, travel mechanism comprises the shape memory allow wires 28 that is erected at the wire between lens mount 18 and the housing 12, packs in a pair of hollow edged electrode 30 in the both ends of this shape memory allow wires 28.
In the lens driver 10 of first scheme of the invention described above, 10A, preferred lens frame 18 has from cylindrical portion 182 outstanding to the radial direction outside, and the hook projection 184 of the pars intermedia 28a of hook shape memory allow wires 28.Each of best a pair of hollow edged electrode 30 comprises: the main cylindrical portion 302 that remains on the housing 12 and extend abreast with optical axis O direction; And from the front end of this main cylindrical portion 302 front end cylindrical portion 304 to 184 bendings of hook projection.Preferred a pair of hollow edged electrode 30 has caulking the 302a that is electrically connected with the both ends of shape memory allow wires 28 respectively at the tail end of main cylindrical portion 302.Preferred caulking 302aB has the concavo-convex inner peripheral surface 302aB ' that stops shape memory allow wires 28 to come off.
In addition, in the lens driver 10A of first scheme of the invention described above, preferably in a pair of hollow edged electrode 30, inject specific resin to inside from the tail end of main cylindrical portion 302.Specific resin both can be the electroconductive resin of silver-colored thickener and so on for example, also can be that the installation to above-mentioned shape memory allow wires 28 strengthens resin.
Have, in the lens driver 10 of first scheme of the invention described above, 10A, guide can comprise the elastomeric element 20 that is configured between lens mount 18 and the housing 12 again.This occasion, elastomeric element 20 support of lens framves 18 make that lens mount 18 can only be shifted to optical axis O direction under the state that radially lens mount 18 has been carried out the location.Elastomeric element 20 can comprise the upside of optical axis O direction of the cylindrical portion 182 that for example is separately positioned on lens mount 18 and the upside leaf spring 22 and the downside leaf spring 24 of downside.Upside leaf spring 22 for example can comprise: be installed on the upper end of lens mount 18 upside ring portion 222, be installed on four upper side ends 224 on the housing 12 and connect upside ring portion 222 respectively and four upside arms 226 of four upper side ends 224.Downside leaf spring 24 can comprise: be installed on the downside internal ring portion 242 of the bottom of lens mount 18, a plurality of downside arms 246 that are installed on the downside outer portion 244 on the housing 12 and connect downside internal ring portion 242 and downside outer portion 244.
According to alternative plan of the present invention, can obtain following charging method, this charging method is the method in a pair of hollow edged electrode 30 of in the said lens drive unit both ends of shape memory allow wires 28 being packed into, it comprises following operation: from the outstanding state of the opposing party's hollow edged electrode 30R tail end, shape memory allow wires 28 is inserted into the operation of tail end of the opposing party's hollow edged electrode 30R with the part of shape memory allow wires 28 from the tail end of a side hollow edged electrode 30L; At the tail end of a side hollow edged electrode 30L, carry out a side hollow edged electrode 30L and shape memory allow wires 28 caulking and form the operation of caulking 302a; By controlling, and shape memory allow wires 28 is moved along its projected direction, thereby adjust the operation of the installation load that is applied on the shape memory allow wires 28 from the part of the outstanding shape memory allow wires 28 of the tail end of the opposing party's hollow edged electrode 30; And after adjusting load,, carry out the opposing party's hollow edged electrode 30R and shape memory allow wires 28 caulking and form the operation of caulking 302a at the tail end of the opposing party's hollow edged electrode 30R.
In the charging method of the alternative plan of the invention described above, preferred caulking 302aB has the concavo-convex inner peripheral surface 302aB ' that stops shape memory allow wires 28 to come off respectively.Can also comprise the operation of cutting to from the part of the outstanding shape memory allow wires 28 of the tail end of the opposing party's hollow edged electrode 30R.The preferred operation from the tail end of a pair of hollow edged electrode 30 to inside that inject specific resin from that also comprises.Above-mentioned specific resin both can be the electroconductive resin that for example is made of silver-colored thickener etc., also can be that the installation to shape memory allow wires 28 strengthens resin.
According to third party's case of the present invention, can obtain following SMA assembly, SMA assembly 32 comprises: the shape memory allow wires 28 of wire and be installed in the pair of electrodes at the both ends of this shape memory allow wires, it is characterized in that pair of electrodes is made of a pair of hollow edged electrode 30 at the both ends of the above-mentioned shape memory allow wires 28 of packing into.
In the SMA assembly 32 of third party's case of the invention described above, a pair of hollow edged electrode 30 preferably include a pair of main cylindrical portion 302 of extending in parallel to each other and from the front end of this a pair of main cylindrical portion to the bent acutangulate a pair of front end cylindrical portion 304 of a close mutually lateral bending.
In addition, certainly, above-mentioned attached reference marks is put on for ease of understanding, nothing but an example, and is not to be defined in this.
Effect of the present invention is as follows.
According to the present invention, owing to make lens mount comprise the shape memory allow wires that is erected at the wire between lens mount and the housing to the travel mechanism that optical axis direction moves, the both ends of the shape memory allow wires of this wire are loaded in a pair of hollow edged electrode, thereby, can easily adjust the installation load that is applied on the shape memory allow wires.
Description of drawings
Fig. 1 is the stereographic map of observing the outward appearance of lens driver from the top in oblique the place ahead of first embodiment of the present invention.
Fig. 2 has omitted lens barrel from lens driver shown in Figure 1, and the stereographic map of observing from the top in oblique the place ahead.
Fig. 3 has gone up side cover outside lens driver shown in Figure 2 has further omitted, and the stereographic map of observing from the top in oblique the place ahead.
Fig. 4 is an exploded perspective view of observing lens driver shown in Figure 2 from the top in oblique the place ahead.
Fig. 5 is the front view of lens driver shown in Figure 3.
Fig. 6 is the stereographic map of the outward appearance of the expression employed hollow edged electrode of lens driver shown in Figure 1.
Fig. 7 is used for illustrating with pack into the flow process of the operation of packing into of a pair of hollow edged electrode of the both ends of shape memory allow wires, omitted the front view of lens driver of the state of last side cover.
Fig. 8 (A) is the cut-open view of expression with hollow edged electrode and the caulking state before of shape memory allow wires, and Fig. 8 (B) is the cut-open view of expression with hollow edged electrode and the caulking state afterwards of shape memory allow wires.
Fig. 9 is the front view of the lens driver of expression second embodiment of the present invention under the state that has omitted lens barrel and last side cover.
Figure 10 is that the lens driver from the 3rd embodiment of the present invention has omitted lens barrel and gone up side cover and from the stereographic map of the top observation in oblique the place ahead outward.
Figure 11 is the key diagram of schematically representing hollow edged electrode and the caulking state before of shape memory allow wires.
Figure 12 is the key diagram of schematically representing hollow edged electrode and the caulking state afterwards of shape memory allow wires.
Among the figure:
10,10A-lens driver, 11-lens barrel (lens subassembly), 12-framework (housing), 14-actuator base, 142-pedestal part, 144-base the place ahead teat, 144a-base the place ahead projection.The 144b-slot, 144c-location indentations, 146-base rear teat, 146a-base rear projection, the last side cover of 16-, 18-lens mount, the 182-cylindrical portion, 184-teat (hook projection), the last bogie side frame teat of 186-, the last bogie side frame jut of 186a-, 20-elastomeric element, 22-upside leaf spring, 222-upside ring portion, 222a-upside spring eye, 224-upper side end, 224a-upper side end hole, 226-upside arm, 24-downside leaf spring, 242-downside internal ring portion, 244-downside outer portion, 246-downside arm, the shape memory allow wires of 28-wire, 28a-pars intermedia, 30-hollow edged electrode, 30L-left side hollow edged electrode, 30R-right side hollow edged electrode, 302-master's cylindrical portion, 302a, the caulking portion of 302aB-, 302aB '-concavo-convex inner peripheral surface, 304-front end cylindrical portion, the 32-SMA assembly, the O-lens axis, AFL-automatic focus lens, the caulking anchor clamps of T-.
Embodiment
Below, with reference to the description of drawings embodiments of the present invention.
The lens driver 10 of first embodiment of the present invention is described with reference to Fig. 1～Fig. 5.Fig. 1 is a stereographic map of observing the outward appearance of lens driver 10 from the top in oblique the place ahead.Fig. 2 is at the stereographic map of observing lens driver 10 under the state that has omitted lens barrel 11 above oblique the place ahead.Fig. 3 is at the stereographic map of observing lens driver 10 under the state that has omitted lens barrel 11 and last side cover 16 above oblique the place ahead.Fig. 4 is at the exploded perspective view of observing lens driver 10 under the state that has omitted lens barrel 11 above oblique the place ahead.Fig. 5 is the front view of expression lens driver 10 under the state that has omitted lens barrel 11 and last side cover 16.
At this,, used rectangular coordinate system (X, Y, Z) as Fig. 1～shown in Figure 5.Under the state of Fig. 1～shown in Figure 5, in rectangular coordinate system (X, Y, Z), X-direction is fore-and-aft direction (depth direction), and Y direction is left and right directions (Width), and Z-direction is above-below direction (short transverse).In the example of Fig. 1～shown in Figure 5, above-below direction Z is the direction of lens axis O.In addition, in this manual, the place ahead is to being also referred to as first side, and the rear is to being also referred to as second side.
But, under the situation that reality is used, the direction of optical axis O, promptly Z-direction becomes fore-and-aft direction.In other words, the last direction of Z axle be the place ahead to, the following direction of Z axle be the rear to.
Illustrated lens driver 10 has with respect to stipulating that by optical axis O and by fore-and-aft direction X and above-below direction Z the plane of (extension) becomes the face symmetrical structure.
Illustrated lens driver 10 for example be contained in can the portable phone of self-focusing band camera on.Lens driver 10 comprises inside the lens barrel that moving lens is automatic focus lens AFL (lens subassembly) 11 is housed.Lens driver 10 is used to make 11 of lens barrels to move to optical axis O direction.
As shown in Figure 1, lens driver 10 has the framework (housing) 12 of the roughly rectangular shape that covers lens barrel 11.In other words, configuration lens barrel 11 in framework (housing) 12.Framework (housing) 12 comprises actuator base 14 and last side cover 16.
On the other hand, though not shown, be equipped with the imaging apparatus that is disposed on the substrate at the central portion of actuator base 14.This imaging apparatus looks like to make a video recording and be converted to electric signal to the subject by moving lens AFL imaging.Imaging apparatus is by formations such as for example CCD (charge coupled device) type imageing sensor, CMOS (complementary metal oxide semiconductor) type imageing sensors.
On the periphery wall of the cylindrical portion 182 of lens mount 18, has the place ahead at fore-and-aft direction X to the outstanding teat 184 in the radial direction outside.Z is outstanding along the vertical direction to the lower end from cylindrical portion 182 for teat 184.This teat 184 is used for the hereinafter described pars intermedia 28a that forms the shape memory allow wires 28 of wire of hook.Therefore, this teat 184 is also referred to as the hook projection.
In addition, as mentioned above, under the situation that reality is used, the last direction of Z-direction (optical axis O direction) become the place ahead to, the following direction of Z-direction (optical axis O direction) become the rear to.Therefore, upside leaf spring 22 is also referred to as the front side spring, and downside leaf spring 24 is also referred to as the rear side spring.
The upside ring portion 222 of upside leaf spring 22 is fixed on the cylindrical portion 182 of lens mount 18.In detail, lens mount 18 has four last bogie side frame teats 186 giving prominence to the radial direction outside from the upper end of cylindrical portion 182.Four last bogie side frame teats 186 have four outstanding upward last bogie side frame jut 186a respectively.The upside ring portion 222 of upside leaf spring 22 has inserts these four four upside leaf spring hole 222a that go up bogie side frame jut 186a respectively.
On the other hand, four of upside leaf spring 22 upper side ends 224 are fixed in a pair of base the place ahead teat 144 and a pair of base rear teat 146 of actuator base 14.In detail, four of upside leaf spring 22 upper side ends 224 have four upper side end hole 224a that embedding is formed at a pair of base the place ahead projection 144a on a pair of base the place ahead teat 144 and is formed at a pair of base rear projection 146a on a pair of base rear teat 146 respectively.
On the other hand, downside leaf spring 24 has the downside internal ring portion 242 on the bottom that is installed in lens mount 18 and is installed in downside outer portion 244 on the actuator base 14.Between downside internal ring portion 242 and downside outer portion 244, be provided with four downside arms 246.That is, four downside arms 246 connect downside internal ring portion 242 and downside outer portion 244.
In addition, in illustrated embodiment,, also can be a plurality of though the number of downside arm 246 is four.
The elastomeric element 20 that is made of upside leaf spring 22 and downside leaf spring 24 can only work at the guide that optical axis O direction moves as guiding lens mount 18.Each of upside leaf spring 22 and downside leaf spring 24 is made of beryllium-bronze, phosphor bronze etc.
Adopt such structure, lens movable part 11,18 can only be moved in optical axis O direction with respect to framework (housing) 12.
Fig. 6 is the stereographic map of the outward appearance of expression hollow edged electrode 30.
As shown in Figure 4, a pair of hollow edged electrode 30 is symmetrical shape.A pair of hollow edged electrode 30 Z in fact along the vertical direction extends.A pair of hollow edged electrode 30 comprises: a pair of main cylindrical portion 302 of Yan Shening in parallel to each other; And from the front end (upper end) of this main cylindrical portion 302 to the bent acutangulate a pair of front end cylindrical portion 304 of a close mutually lateral bending.
In addition, in illustrated embodiment, the gauge or diameter of wire of marmem (SMA) line 28 is 50 μ m, and the internal diameter of hollow edged electrode 30 is 0.3mm.In addition, the both ends of shape memory allow wires 28 are contained in a pair of hollow edged electrode 30.The both ends of shape memory allow wires 28 just are not inserted in a pair of front end cylindrical portion 304 of a pair of hollow edged electrode 30, also are inserted in the whole length range of a pair of main cylindrical portion 302.That is, a pair of hollow edged electrode 30 plays the effect of the guiding of shape memory allow wires 28.Thus, as described later, can adjust the installation load that shape memory allow wires 28 is applied at an easy rate.
In other words, as shown in Figures 3 and 4, each of a pair of hollow edged electrode 30 comprises: the main cylindrical portion 302 that remains on the housing 12 and extend abreast with optical axis O direction; And from the front end (upper end) of this main cylindrical portion 302 front end cylindrical portion 304 to hook projection 184 bendings of lens mount 18.
With reference to Fig. 3 and Fig. 5, to the installment state of SMA assembly 32 to a pair of base the place ahead of actuator base 14 teat 144 described.
A pair of main cylindrical portion 302 engagings of a pair of hollow edged electrode 30 also remain among a pair of slot 144b that is formed at a pair of base the place ahead teat 144.A pair of front end cylindrical portion 304 location of a pair of hollow edged electrode 30 also remain among a pair of location indentations 144c that is formed at a pair of base the place ahead teat 144.Thus, 28 of shape memory allow wires are extended in the plane by above-below direction Z and left and right directions Y regulation.In addition, each hollow edged electrode 30 is electrically connected with the end of shape memory allow wires 28 by the bottom of caulking main cylindrical portion 302 as described later.That is, a pair of hollow edged electrode 30 has caulking the 302a that is electrically connected with the both ends of shape memory allow wires 28 respectively at the tail end of main cylindrical portion 302.
So, SMA assembly 32 is installed on a pair of base the place ahead teat 144 of actuator base 14.In addition, the pars intermedia 28a of shape memory allow wires 28 is hooked on the teat (hook projection) 184 of lens mount 18.That is, shape memory allow wires 28 is erected between lens mount 18 and the housing 12.
Below, the action roughly of lens driver 10 is described.
As everyone knows, so-called " marmem " is meant that having the deflection that obtains in advance becomes zero and recover the metal of the character of original form in specific temperature province.Marmem is made of for example TiNi alloy.
In addition, illustrated shape memory allow wires 28 is to be shrunk to the contracted length of memory in advance during self-heating by energising, and turns back to the line of the type of the original length (length of relaxed state) of predesignating when stopping to switch on by natural cooling.
Above-mentioned elastomeric element 20 plays along the effect afterburning downwards to lens mount 18 of optical axis O direction.On the other hand, shape memory allow wires 28 is if then shrink its energising by a pair of hollow edged electrode 30 from driving circuit (not shown).Its result, lens mount 18 overcomes elastomeric element 20 downward acting forces and moves up along optical axis O direction.
On the other hand, as if the energising that stops shape memory allow wires 28, then shape memory allow wires 28 is cooled naturally.Its result is owing to elastomeric element 20 downward acting forces make shape memory allow wires 28 elongations.Its result, lens mount 18 is directed downwards mobile along optical axis O.
That is, shape memory allow wires 28 is because its energising/caused temperature variation of not switching on and flexible along optical axis O direction, as lens mount 18 is worked along travel mechanism that optical axis O direction moves.
The combined support of elastomeric element 20 and SMA assembly 32 lens movable part 11,18 can move it along optical axis O direction, plays a role as the lens drive division 20,32 that drives lens movable part 11,18 simultaneously.
As shown in Figure 5, lens drive division 20,28 disposes side by side with lens movable part 11,18 relative optical axis O.Therefore, can make the whole height of lens driver 10 lower.
Below, with reference to Fig. 7 and Fig. 8, the method for a pair of hollow edged electrode 30 of being packed in the both ends of shape memory allow wires 28 is described.Fig. 7 is the flow process that is used to illustrate the operation of packing into of shape memory allow wires 28, has omitted the front view of lens driver 10 of the state of last side cover 16.Fig. 8 (A) represents that with the cut-open view of hollow edged electrode 30 with shape memory allow wires 28 caulking states before Fig. 8 (B) is that expression is with the cut-open view of hollow edged electrode 30 with shape memory allow wires 28 caulking states afterwards.
Among Fig. 7, in order to distinguish a pair of hollow edged electrode 30, to a side hollow edged electrode promptly the hollow edged electrode in left side put on the reference marks of 30L, be the reference marks that the hollow edged electrode on right side is put on 30R to the opposing party's hollow edged electrode.
Shown in Fig. 7 (A), at first, with shape memory allow wires 28 in a pair of hollow edged electrode 30 when the lower end (tail end) of the hollow edged electrode 30L in left side is directed to the lower end (tail end) of hollow edged electrode 30R on right side, be inserted in a pair of hollow edged electrode 30.At this moment, the pars intermedia 28a of shape memory allow wires 28 is hooked on the hook projection 184 of lens mount 18.And at this moment, shown in Fig. 7 (A), the part of shape memory allow wires 28 is exposed (giving prominence to) from the lower end (tail end) of the hollow edged electrode 30R on right side.
Subsequently, in the position shown in the arrow A of Fig. 7 (A),, as shown in Figure 8, carry out the caulking of the hollow edged electrode 30L in left side and shape memory allow wires 28 promptly in the bottom (tail end) of the main cylindrical portion 302 of the hollow edged electrode 30L in left side.
Then, shown in the arrow B of Fig. 7 (A), the part of the shape memory allow wires 28 of (giving prominence to) is exposed in clamping (controlling) from the lower end (tail end) of the main cylindrical portion 302 of the hollow edged electrode 30R on right side, shape memory allow wires 28 is moved up and down along above-below direction Z (its projected direction), thereby be adjusted at the installation load on the pars intermedia 28a that is applied to shape memory allow wires 28 of hook projection 184.
After load adjust to be installed,,, as shown in Figure 8, carry out the caulking of the hollow edged electrode 30R on right side and shape memory allow wires 28 promptly in the bottom (tail end) of the main cylindrical portion 302 of the hollow edged electrode 30R on right side in the position shown in the arrow C of Fig. 7 (B).
Then, cut a part of exposing the shape memory allow wires 28 of (giving prominence to) from the lower end (tail end) of the main cylindrical portion 302 of the hollow edged electrode 30R on right side.
The lens driver 10 of above-mentioned first embodiment has effect as described below.
As reference Fig. 7 (A) and Fig. 7 (B) are illustrated, can adjust the installation load that shape memory allow wires 28 is applied at an easy rate.
In addition, shown in Fig. 8 (A) and Fig. 8 (B), being electrically connected operation (caulking operation) and can carrying out at an easy rate of shape memory allow wires 28 and a pair of hollow edged electrode 30.That is, and carry out caulking comparing after existing will being turned back by the electrode that sheet metal constitutes, the hollow edged electrode 30 of the application of the invention embodiment can freely be selected caulking point (electric connection point), and can carry out caulking reliably
Have again, because effective length (that is, the line length between the electric connection point (caulking point)) that can elongate form memorial alloy line 28, thereby can increase lens shift amount (path increment of lens movable part 11,18).It is the reasons are as follows: because the lens driver 10 of present embodiment can make shape memory allow wires 28 be stretched over the bottom surface side of actuator base 14 along a pair of hollow edged electrode 30, so can carry out caulking with shape memory allow wires 28 a pair of hollow edged electrode 30 in the bottom of a pair of hollow edged electrode 30 (tail end).Thereby, can increase the amount of contraction of shape memory alloy wire 28.Its result can increase the lens shift amount.
Below, with reference to Fig. 9, the lens driver 10A of second embodiment of the invention is described.Fig. 9 is the front view of lens driver 10A that the state of lens barrel 11 and last side cover 16 has been omitted in expression.
Illustrated lens driver 10A has the structure identical with Fig. 1 lens driver extremely shown in Figure 5 10, and carries out work except inject this point of (coatings) specific as described later resin in the inside of a pair of hollow edged electrode 30.Put on identical reference marks and omitted explanation for the textural element identical them with the textural element of lens driver 10, below only difference is described.
In illustrated lens driver 10A, shown in the arrow D of Fig. 9, innerly injected (coating) as the electroconductive resin of specific resin from the lower end (tail end) of the main cylindrical portion 302 of a pair of hollow edged electrode 30 to it.As electroconductive resin, can use for example silver-colored thickener.Thus, can realize conducting between a pair of hollow edged electrode 30 and the shape memory allow wires 28 reliably.
In addition, in lens driver 10A shown in Figure 9,, also can use installation enhancing resin to replace electroconductive resin to shape memory allow wires 28 though use electroconductive resin as specific resin.At this moment, shape memory allow wires 28 can be installed on a pair of hollow edged electrode 30 reliably.
In a word, in lens driver of the present invention, after finishing, can inject in goods (coating) specific resin.
Below, with reference to Figure 10 to Figure 12, the lens driver 10B of third embodiment of the invention is described.Figure 10 is that the lens driver from the 3rd embodiment of the present invention has omitted lens barrel and gone up side cover and from the stereographic map of the top observation in oblique the place ahead outward.Figure 11 is the key diagram of schematically representing hollow edged electrode and the caulking state before of shape memory allow wires.Figure 12 is the key diagram of schematically representing hollow edged electrode and the caulking state afterwards of shape memory allow wires.
Illustrated lens driver 10B has the hereinafter described difference except the mode at formed caulking the 302aB of tail end of the main cylindrical portion 302 of a pair of hollow edged electrode 30, have with Fig. 1 to the identical structure of lens driver shown in Figure 5 10, and carry out work.Put on identical reference marks and omitted explanation for the textural element identical them with the textural element of lens driver 10, below only difference is described.。
Illustrated lens driver 10B such as Figure 10 be to shown in Figure 12, and caulking the 302aB of tail end that is formed at the main cylindrical portion 302 of a pair of hollow edged electrode 30 has the concavo-convex inner peripheral surface 302aB ' that stops shape memory allow wires 28 to come off.In addition, in the outer peripheral face side of caulking 302aB, also be formed with corresponding jog with concavo-convex inner peripheral surface 302aB '.
This concavo-convex inner peripheral surface 302aB ' forms a plurality of concave portions and convex portion is alternately repeated along the length direction of main cylindrical portion 302.
As Figure 11 and shown in Figure 12, by using the caulking anchor clamps T that has male and fomale(M﹠F) in pushing face side with main cylindrical portion 302 butts, main cylindrical portion 302 and shape memory allow wires 28 are carried out caulking, thereby form this caulking 302aB.
In addition, though Figure 11 and caulking anchor clamps T shown in Figure 12 have male and fomale(M﹠F) at two pushing masks with main cylindrical portion 302 butts, also can use the caulking anchor clamps T that male and fomale(M﹠F) is only arranged at the pushing mask of a side.
Thus, because the concavo-convex inner peripheral surface 302aB ' of caulking 302aB engages with the concavo-convex of shape memory allow wires 28, thereby can prevent that shape memory allow wires 28 from coming off from the main cylindrical portion 302 of hollow edged electrode 30, and, because bonding area between the outer peripheral face of concavo-convex inner peripheral surface 302aB ' and shape memory allow wires 28 and number of contacts increase, thereby can suppress the resistance inequality between shape memory allow wires 28 and the hollow edged electrode 30.
More than, though with reference to its embodiment the present invention has been carried out explanation especially, the present invention is not limited to these embodiments.To those skilled in the art, only otherwise exceed the invention spirit and the scope of protection scope of the present invention defined, can carry out various changes to form and details.For example, guide (elastomeric element) is not limited to the mechanism of above-mentioned embodiment, also can use other various mechanisms.
Claims (22)
1. a lens driver possesses: the lens mount that comprises the cylindrical portion that keeps lens barrel; Support the housing that the said lens frame makes that this lens mount can only move to optical axis direction; Make the said lens frame to travel mechanism that above-mentioned optical axis direction moves; And the guiding said lens frame guide that can only move to above-mentioned optical axis direction, it is characterized in that,
Above-mentioned travel mechanism comprises the shape memory allow wires that is erected at the wire between said lens frame and the above-mentioned housing, packs in a pair of hollow edged electrode in the both ends of this shape memory allow wires.
2. lens driver according to claim 1 is characterized in that,
The said lens frame has from above-mentioned cylindrical portion outstanding to the radial direction outside, and the hook projection of the pars intermedia of the above-mentioned shape memory allow wires of hook.
3. lens driver according to claim 2 is characterized in that,
Each of above-mentioned a pair of hollow edged electrode comprises: the main cylindrical portion that remains on the above-mentioned housing and extend abreast with above-mentioned optical axis direction; And from the front end of this main cylindrical portion front end cylindrical portion to the bending of above-mentioned hook projection.
4. lens driver according to claim 3 is characterized in that,
Above-mentioned a pair of hollow edged electrode has the caulking portion that is electrically connected with the both ends of above-mentioned shape memory allow wires respectively at the tail end of above-mentioned main cylindrical portion.
5. lens driver according to claim 4 is characterized in that,
Above-mentioned caulking portion has the concavo-convex inner peripheral surface that stops above-mentioned shape memory allow wires to come off.
6. according to claim 4 or 5 described lens drivers, it is characterized in that,
In above-mentioned a pair of hollow edged electrode, inject specific resin to inside from the tail end of above-mentioned main cylindrical portion.
7. lens driver according to claim 6 is characterized in that,
Above-mentioned specific resin is an electroconductive resin.
8. lens driver according to claim 7 is characterized in that,
Above-mentioned electroconductive resin is made of silver-colored thickener.
9. lens driver according to claim 6 is characterized in that,
Above-mentioned specific resin is the installation enhancing resin to above-mentioned shape memory allow wires.
10. according to any one described lens driver in the claim 1～9, it is characterized in that,
Above-mentioned guide comprises the elastomeric element that is configured between said lens frame and the above-mentioned housing, and above-mentioned elastomeric element supports the said lens frame and makes that the said lens frame can only be to above-mentioned optical axis direction displacement under the state that radially the said lens frame has been carried out the location.
11. according to any one described lens driver in the claim 1～10, it is characterized in that,
Above-mentioned elastomeric element comprises the upside of optical axis direction of the cylindrical portion that is separately positioned on the said lens frame and the upside leaf spring and the downside leaf spring of downside.
12. lens driver according to claim 11 is characterized in that,
Above-mentioned upside leaf spring has: the upside ring portion that is installed on the upper end of said lens frame; Be installed on four upper side ends on the above-mentioned housing; And four upside arms that connect above-mentioned upside ring portion and above-mentioned four upper side ends respectively.
13. according to claim 11 or 12 described lens drivers, it is characterized in that,
Above-mentioned downside leaf spring has: the downside internal ring portion that is installed on the bottom of said lens frame; Be installed on the downside outer portion on the above-mentioned housing; And a plurality of downside arms that connect above-mentioned downside internal ring portion and above-mentioned downside outer portion.
14. a charging method is the method in the above-mentioned a pair of hollow edged electrode of in any one described lens driver the both ends of above-mentioned shape memory allow wires being packed in claim 1 to 3, it is characterized in that, comprises following operation:
From the outstanding state of the tail end of the opposing party's hollow edged electrode, above-mentioned shape memory allow wires is inserted into the operation of tail end of above-mentioned the opposing party's hollow edged electrode with the part of above-mentioned shape memory allow wires from the tail end of a side hollow edged electrode;
At the tail end of an above-mentioned side's hollow edged electrode, carry out an above-mentioned side's hollow edged electrode and above-mentioned shape memory allow wires caulking and form the operation of caulking portion;
By the part of clamping from the outstanding above-mentioned shape memory allow wires of the tail end of above-mentioned the opposing party's hollow edged electrode, and above-mentioned shape memory allow wires is moved along its projected direction, thereby adjust the operation of the installation load that is applied on the above-mentioned shape memory allow wires; And
After adjusting above-mentioned load,, carry out above-mentioned the opposing party's hollow edged electrode and above-mentioned shape memory allow wires caulking and form the operation of caulking portion at the tail end of above-mentioned the opposing party's hollow edged electrode.
15. charging method according to claim 14 is characterized in that,
Above-mentioned caulking has the concavo-convex inner peripheral surface that stops above-mentioned shape memory allow wires to come off respectively.
16. according to claim 14 or 15 described charging methods, it is characterized in that,
Also comprise the operation of cutting to from the part of the outstanding above-mentioned shape memory allow wires of the tail end of above-mentioned the opposing party's hollow edged electrode.
17. charging method according to claim 16 is characterized in that,
Also comprise operation from the tail end of above-mentioned a pair of hollow edged electrode to inside that inject specific resin from.
18. charging method according to claim 17 is put, it is characterized in that,
Above-mentioned specific resin is an electroconductive resin.
19. charging method according to claim 18 is characterized in that,
Above-mentioned electroconductive resin is made of silver-colored thickener.
20. charging method according to claim 17 is characterized in that,
Above-mentioned specific resin is the installation enhancing resin to above-mentioned shape memory allow wires.
21. a SMA assembly comprises the shape memory allow wires of wire and is installed in the pair of electrodes at the both ends of this shape memory allow wires, it is characterized in that,
Above-mentioned pair of electrodes is made of a pair of hollow edged electrode at the both ends of the above-mentioned shape memory allow wires of packing into.
22. SMA assembly according to claim 21 is characterized in that,
Above-mentioned a pair of tubulose electrode package draw together in parallel to each other a pair of main cylindrical portion of extending and from the front end of this a pair of main cylindrical portion to the bent acutangulate a pair of front end cylindrical portion of a close mutually lateral bending.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-120553 | 2009-05-19 | ||
| JP2009120553 | 2009-05-19 | ||
| JP2010038400A JP2011002811A (en) | 2009-05-19 | 2010-02-24 | Lens driving device, method for setting inside and sma assembly |
| JP2010-038400 | 2010-02-24 |
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| Publication Number | Publication Date |
|---|---|
| CN101893748A true CN101893748A (en) | 2010-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010180980XA Pending CN101893748A (en) | 2009-05-19 | 2010-05-17 | Lens driver, charging method and SMA assembly |
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| CN (1) | CN101893748A (en) |
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Application publication date: 20101124 |