CN110007542A - Shape memory alloy actuation apparatus - Google Patents
Shape memory alloy actuation apparatus Download PDFInfo
- Publication number
- CN110007542A CN110007542A CN201811543160.5A CN201811543160A CN110007542A CN 110007542 A CN110007542 A CN 110007542A CN 201811543160 A CN201811543160 A CN 201811543160A CN 110007542 A CN110007542 A CN 110007542A
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- China
- Prior art keywords
- bearing
- sma
- shape memory
- memory alloy
- support construction
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/06—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/06—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like
- F03G7/065—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like using a shape memory element
-
- 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
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- 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
-
- 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
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
- G03B3/10—Power-operated focusing
Abstract
This application involves shape memory alloy actuation apparatus.SMA actuation means include support construction and the displaceable element by suspension system supports on the support structure, the movement that suspension system guiding is driven by the SMA actuator line of a length section.The SMA actuator line of the length section is relative to the plane for being orthogonal to moving direction with the angle tilt in 5 to 15 degree ranges.
Description
This technology relates generally to a kind of marmem (SMA, shape memory alloy) actuation means, wherein
SMA actuator line (at least one length of SMA actuator wire) driving of at least one length section is removable
Dynamic movement of the element relative to support construction.Particularly, this technology be related to making SMA actuation means along moving direction total height most
Smallization.
This technology provides a kind of shape memory alloy actuation apparatus, comprising: support construction；By suspension system
The displaceable element of (suspension system) support on the support structure, the suspension system include bearing arrangement
(bearing arrangement), bearing arrangement are arranged to guiding displaceable element relative to support construction along the side of movement
To movement；The shape memory alloy actuator line of at least one length section, be connected to support construction and displaceable element it
Between, for driving movement of the displaceable element relative to support construction, the wherein shape memory alloy actuator line of the length section
Relative to the plane for being orthogonal to moving direction with the angle tilt in 5 to 15 degree ranges.
It is contemplated that such angle will not be ideal, because there are the machinery of increase to increase as angle is smaller
Beneficial (mechanical gain), this so that can expectability keep actuator line more sensitive and be more difficult to control, to be difficult to keep
The stability of the position of displaceable element.However, astoundingly, it has been found that in practice, by using suitable bearing
Arrangement come guide displaceable element relative to support construction moving along moving direction, can actually be in such angular range
Interior holding lens stabilization.
This technology can be applied to optical device, and wherein displaceable element is the lens element for including at least one lens,
Optical axis of the middle moving direction along lens element.For example, SMA actuation means can be camera, wherein support construction has installation
Imaging sensor on it, and lenticular element arrangement focuses on the image sensor at by image.
In the case where optical device, SMA actuation means are particularly advantageous along the reduction of the height of moving direction, because
Being highly desirable in actual implementation makes the minimized height.
Advantageously, which can be made of glass.It is nearest for replacing plastic lens using glass lens
Trend, because glass lens improves picture quality, and due to refractive index with higher, usually more than its plastics analog
It is thin.However, glass lens is heavier than its plastics analog, it is therefore desirable to bigger actuating power.Further, since glass lens is than modeling
Expect that lens are thinner, lens element is reduced along the height of optical axis, however, the moving range needed for optical axis mobile lens (stroke) needs
It keeps at least identical, and must be realized in the case where not slanted lenticular.The first aspect of the invention reduce this two
A problem.The smaller angle of the SMA actuator line of at least one length section provides the biggish power for being suitable for glass lens.This
Outside, the smaller angle of the SMA actuator line of at least one length section allows to keep mobile range.
The preferred feature of this technology is elaborated in appended dependent claims.
Detailed description of the invention
The embodiment of this technology is only described by way of example with reference to the drawings, in the accompanying drawings:
Fig. 1 is the perspective view of the first SMA actuation means；
Fig. 2 is the exploded view of the first SMA actuation means；
Fig. 3 is the side view of the first SMA actuation means；
Fig. 4 to fig. 6 is the plan view arranged for the different bearings of the first SMA actuation means；
Fig. 7 is the cross-sectional view for the alternative bearing of the first SMA actuation means, shifting of the cross section perpendicular to bearing
Dynamic direction interception；
Fig. 8 is the side view of the alternative bearing of Fig. 7；
Fig. 9 is the cross-sectional view for the alternative bearing of the first SMA actuation means, shifting of the cross section perpendicular to bearing
Dynamic direction interception；
Figure 10 is the side view of the alternative bearing of Fig. 9；
Figure 11 is the perspective view of the 2nd SMA actuation means；
The perspective view for the step of Figure 12 is during manufacturing the 2nd SMA actuation means；
Figure 13 is the perspective view of the 3rd SMA actuation means；
Figure 14 is the side view of the strut members (strut element) used during manufacturing the 3rd SMA actuation means；
And
Figure 15 and Figure 16 is the schematic side elevation of two kinds of alternative forms of the 4th SMA actuation means.
In summary, this technology provides a kind of shape memory alloy actuation apparatus, the shape memory of one of length section
Alloy actuator line is relative to the plane for being orthogonal to moving direction with the angle tilt in 5 to 15 degree ranges.
It relative to the translational movement of support construction is known that displaceable element is driven using SMA actuator line.SMA is caused
Dynamic device line has special advantage in micromodule equipment, and can be applied to include handheld device (such as camera and movement
Phone) including large-scale consumer-elcetronics devices in.
For example, this SMA actuator line can be used in optical device (such as camera), for driving camera saturating
Mirror element such as to realize focuses (automatic focus, AF) or zoom along the translational movement of its optical axis.This camera may be small
, and advantage of lower cost, and provide a large amount of functions, these functions are applied not only to take pictures, be also used to video calling, scanning,
Object identification, safety etc..It is disclosed in WO2007/113478, WO2009/056822 and WO2017/134456 such
The example of the SMA actuation means of camera.
This SMA actuator line can be similarly used in optical device (such as camera), for driving camera
Lens element transverse to optical axis translational movement, such as to provide optical image stabilization (OIS).WO2013/175197 and
The example of the SMA actuation means of such camera is disclosed in WO2014/083318.
In WO2007/113478, displaceable element is the camera lens by suspension system supports on the support structure
Element, the suspension system include guiding the bool (flexures) being moved in translation along optical axis.It is described in WO2007/113478
An example in, SMA actuator line is (a piece of) SMA wire, which is connected to branch in its end
Support structure, and in the hook being hooked on camera lens element, to be moved in translation for driving.By the part SMA wire in hook
The straight SMA actuator line that part on shape part either side is formed is relative to the moving direction for being parallel to optical axis to be greater than 0 degree
Acute angle extends.Compared with the SMA actuator line extended along moving direction, make SMA actuator far from moving direction in this way
Line is angled to increase mobile amount.In order to maximize path increment, need to maximize the length of SMA actuator line.However, still
Need SMA actuator line and moving direction at an acute angle, so that the component shunk works in the direction of movement.WO2007/
113478 disclose an example, wherein SMA actuator line relative to optical axis with 70 degree of angle tilt, i.e., relative to being orthogonal to
The plane of moving direction tilts 20 degree.
Therefore, compared with WO2007/113478, in this technique, the SMA actuator line of at least one length section relative to
The angle for being orthogonal to the plane of moving direction is reduced, so that the angle is in the range of 5 to 15 degree, and preferably 8
To in the range of 12 degree.Lesser angle allows SMA actuation means to reduce along the total height of moving direction, because of SMA actuator
The length of line itself necessarily has the range (extent projected) of the projection along moving direction, this is in SMA actuation means
Height on minimum dimension is set.
In other words, the embodiment of this technology provides a kind of actuator, the SMA which will tilt/be at an angle of
Actuator line is combined with bearing arrangement, to control the movement with the displaceable element of guiding actuating device.In general, small inclination
Angle increases the gain of actuator, and may make more to be hard to keep the stability of displaceable element in specific position.However, small angle
The combination of degree SMA actuator line and bearing arrangement solves the problems, such as this, appoints as caused by small inclination angle because bearing can be resisted
What increased cross force (lateral force).One advantage of this technology is that can not have the feelings of any loss in path increment
Small actuator is produced under condition.Small actuator is needed, because actuator is for consumer-elcetronics devices (for example, intelligent hand
Machine) in, and existing makes consumer-elcetronics devices be made to smaller and thinner market pressure.
SMA actuation means 1 are shown in Fig. 1 and Fig. 2, which is camera.SMA actuation means 1 include
Support construction 2, support construction 2 have imaging sensor 3 mounted thereto.
Support construction 2 includes pedestal 4, and pedestal 4 is rigid plate.Imaging sensor 3 is fixed to the front side of pedestal 4.In Fig. 1
Shown in using Hall sensor (Hall sensor) 9 control SMA actuation means 1 arrangement in, support construction 2 support fix
To the IC chip 5 of the rear side of pedestal 4.Alternatively, resistance control can be used to control SMA actuation means 1, in such case
Under, IC chip 5 can be in the outside of SMA actuation means 1.As described further below, control circuit is real in IC chip 5
It is existing.
Support construction 2 further includes chassis 6, and chassis 6 is prominent from pedestal 4, and can be moulding part.As described below
, chassis 6 is used as the mounting platform of various elements, and further defines any fixed reference feature needed in period of assembly.Chassis 6
With the centre bore 7 being aligned with imaging sensor 3.In arrangement shown in Fig. 1, support construction 2 further includes being fixed to chassis 6
Outside flexible print circuit 8.Typically, the offer of flexible print circuit 8 VDD, GND, SCL connect pad with SDA and (do not show
Out).On flexible print circuit 8, Hall sensor 9 is fixed close to the magnet 26 supported by support construction 6.
SMA actuation means 1 further include shield (shield can) 10, under which is cooperated to pedestal 4 and covers
All other component described in face, to prevent physical damage and dust from entering.
SMA actuation means 1 further include lens element 20, and in this example, which is displaceable element.Lens
Element 20 includes lens holder 25, and lens holder 25 keeps lens 21, but alternatively, may exist multiple lens.Lens
21 can be made of glass or plastics.Lens element 20 has the optical axis O that is aligned with imaging sensor 3, and be arranged to by
Image focuses on imaging sensor 3.Lens element 20 also has protruding portion 22, and the transverse direction that protruding portion 22 is formed in optical axis O is prominent
On side out.
There are Hall sensor 9, the lens holder 25 of lens element 20 will also be relative to Hall sensor 9
The magnet 26 of positioning is installed on the support structure 2, so that Hall sensor 9 senses lens element 20 along the position of optical axis O.
SMA actuation means 1 are micro-optical devices.In some examples of micro-optical devices, lens 21 (or it is multiple
Mirror, when present) it can have at most 20mm, preferably no more than 15mm, the more preferably up to diameter of 10mm.
Although SMA actuation means 1 are cameras in this example, this is not usually necessary.In some instances,
SMA actuation means 1 can be optical device, and wherein displaceable element is lens element, but not have imaging sensor.Other
In example, SMA actuation means 1 can be one type of device, that is, the device is not optical device, and wherein may be used
Moving element is not lens element and no imaging sensor.
SMA actuation means 1 further include suspension system 30, and suspension system 30 supports lens element 20 on the support structure 2.
Suspension system 30 be configured to guiding lens element 20 along optical axis O (therefore, optical axis O is moving direction in this example) relative to
The movement of support construction 2, while limiting movement of the lens element 20 in other freedom degrees relative to support construction 2.Suspension system
System 30 includes that bearing is arranged, bearing arrangement will be described in greater detail below.
SMA actuation means 1 further include the SMA actuator line 40 of two length sections, the SMA actuator line of the two length sections
40 are arranged as follows to drive the moving along optical axis O of lens element 20.The SMA actuator line 40 of two length sections is one
The part of SMA actuator line 41, the part SMA actuator line 41 is in every an end portion by being fixed on chassis 6 on relative angle
Crimping portion (crimp portion) 42 at top is connected to support construction 2.Crimping portion 42 crimps the part SMA actuator
Line 41 is to provide mechanical connection and electrical connection.The part SMA actuator line 41 is connected to also by being hooked on around protruding portion 22
Lens element 20.Therefore, each of SMA actuator line 40 of these length sections is connected to support construction 2 at portion at one end,
And lens element 20 is connected at the other end.
The SMA actuator line 40 of these length sections has the angled V-arrangement cloth that type is disclosed in WO2007/113478
It sets, as described below.
When observing along optical axis O, the SMA actuator line 40 of these length sections has 90 degree of angle between them,
Optical axis O is moving direction in this example.More generally, the orientation of the SMA actuator line 40 of these length sections can change, and make
Angle when obtaining along optical axis O observation between them has any size less than 180 degree, preferably in 70 degree to 110 degree of model
In enclosing.
In addition, the SMA actuator line 40 of each length section is relative to being orthogonal to the plane of optical axis O in a same direction
(in the same sense) and with the inclination of identical acute angle theta, optical axis O is moving direction in this example, as shown in Figure 3.
In this example, angle, θ is selected to relative to the 5 of the plane for being orthogonal to moving direction degree or under more preferably 8 degree
Limit, in the range of 15 degree or more preferably 12 degree of the upper limits.Thus, for example angle, θ is opposite compared with WO2007/113478
It is smaller.This allows SMA actuation means 1 to reduce along the total height of optical axis O, because the SMA actuator line 40 of these length sections is along light
The range of axis O projection reduces.
This low numerical value of angle, θ increases the strain on the SMA actuator line 40 of gain and these length sections, the gain
It is the ratio (ratio) of the variation in the length of amount of movement and the SMA actuator line 40 of these length sections, which needs to drive
Increase on the power of signal.These factors may make the stability for keeping 20 position of lens element become more difficult.However,
Surprisingly it has been found that in practice, in SMA actuation means 1, can actually be kept in such angular range
The stability of lens element 20.This is partly due to be formed as suspension system 30 bearing arrangement (will retouch in more detail below
State) because bearing resists increased cross force.This also has benefited from that lens 21 are made of glass, because compared with using plastics, volume
Outer quality means that the additional horizontal force of the SMA actuator 40 from these length sections is advantageous, so that allowing to manufacture can
Capable equipment.However, will reduce lens by resonance frequency more again, this may cause ambient vibration as a problem.Due to line
The reduction of angle also reduces resonance frequency, therefore there are the lower limits of acceptable line angular range.
Although selected angle θ is advantageous within the scope of 8 degree to 12 degree, this is not required, and angle, θ can select
It is selected as that there are other numerical value, such as the numerical value more than 12 degree or more than 15 degree.
When applying driving signal, the SMA actuator line 40 of these length sections drives lens element 20 to move along optical axis O, should
Driving signal causes the heating and cooling of the SMA actuator line 40 of these length sections.40 quilt of SMA actuator line of these length sections
It heats to driving signal resistance-type, and cold by being carried out with the heat transfer of ambient enviroment when the power of driving signal is reduced
But.The SMA actuator line 40 of these length sections is shunk when heated, thus drive lens element 20 along optical axis O in a first direction
The movement of upper (Fig. 1 and Fig. 2 in upwards).
SMA actuation means 1 further include compressed spring 11, which is connected to the pedestal 4 and lens of support construction 2
Between element 20, and elastic bias components are served as the SMA actuator line 40 of these length sections.Therefore, when these
When the SMA actuator line 40 of length section is cooling, 11 drives edge optical axis O of compressed spring is in the opposite direction (downward in fig. 1 and 2)
On movement.Therefore, the temperature of the SMA actuator line 40 of these length sections can be controlled by controlling the power of driving signal
Degree, and thereby lens element 20 is controlled along the position of optical axis O.
The control circuit realized in IC chip 5 generates driving signal and is supplied to these length connected to it
The SMA actuator line 40 of section.Control circuit receives expression lens element 20 along the input signal of the desired locations of optical axis O, and produces
It is raw that there is the driving signal for being selected for the power by the driving of lens element 20 to desired locations.The power of driving signal can be with
It is linear, or pulsewidth modulation (pulse width modulation) can be used to change.
It can be come based on sensing lens element 20 along the output of the Hall sensor 9 of the position of optical axis O using closed-loop control
Generate driving signal.
Alternatively, resistance feedback control technology can be used and generate driving signal, which for example can such as exist
WO2013/175197；WO2014/076463；WO2012/066285；WO2012/020212；WO2011/104518；WO2012/
038703；It is realized disclosed in any one of WO2010/089529 or WO2010029316, it is each in these files
It is a to be hereby incorporated by reference in its entirety by reference.
Suspension system 30 described now with reference to fig. 4 to fig. 6, fig. 4 to fig. 6 show three kinds of rolling bearing 31 it is different
Bearing arrangement.
Suspension system 30 includes that the bearing of multiple rolling bearings 31 is arranged.Each of rolling bearing 31 includes support knot
Bearing table on bearing surface 32 and lens element 20 on structure 2 (especially on chassis 6) (especially on lens holder 25)
Face 33.Each of rolling bearing 31 further includes one or more balls 34 being arranged between bearing surface.Therefore, it rolls
Pearl 34 serves as rolling bearing component, however optionally, other types of rolling bearing component also can be used, such as roll
Son.
It is desirable that the bearing surface 32 in support construction 2 has low surface roughness, incline to minimize friction and dynamic
Tiltedly.In some cases, it then may be enough that bearing surface 32, which is flastic molding surface,.It is highly preferred that bearing surface 32 by
Metal is made.When chassis 6 is molded element, this is arranged on the metal insert 35 in chassis 6 by bearing surface 32
Surface is realized.Similarly, alternatively, or in addition, the bearing surface 33 on lens element 20 can be metal surface, the gold
Metal surface is formed as being arranged in the surface of the metal insert in lens holder, which is also molded element.
By metal formed bearing surface 32 (and/or bearing surface 33) impart ball 34 can operate on it is smooth
Surface, and allow for the dynamic tilt performance needed.The defects of bearing surface 32 and bearing surface 33 may cause dynamic
State inclination.The form of surface curvature and surface roughness may be presented in this defect.If the quantity of ball 34 is reduced, Huo Zhe
In the case where multiple balls 34, if the distance between contact point of upper spheres and lower spheres 34 is reduced, bearing surface
32 and influence of the defect to dynamic tilt of bearing surface 33 increase.
The different bearing arrangement of three kinds of bearing 31 is arranged as follows.
The arrangement of first bearing shown in Fig. 4 includes four following bearing 31a-31d of arrangement.
In each of bearing 31a-31d, the bearing surface 32 in support construction 2 is plane surface (planar
Surface), the bearing surface 33 and on lens element 20 is groove (alternatively, however, the bearing surface in support construction 2
32 can be groove, and the bearing surface 33 on lens element 20 can be plane surface).Here and bearing surface is
The other positions of groove are applicable in following aspect.When ball 34 rolls, the groove of bearing surface 33 is along a pair of of parallel lines and ball
34 generate contact.Plane surface on bearing surface 33 be substantially parallel to the contact portion in the groove of bearing surface 33 this one
To parallel lines.
Due to including plane surface on bearing surface 32, so each of bearing 31a-31d limits bearing surface
32 and the movement toward each other of bearing surface 33, but the transverse shifting of bearing surface 32 and bearing surface 33 is not limited.
When along optical axis O observation, two bearings 31a, 31b are on the opposite side that protruding portion 22 is located in protruding portion 22.
These bearings 31a, 31b include multiple balls 34, usually three balls 34, as shown in Figures 1 and 2.Setting three or
In the case where more balls 34, internal ball 34 is used as diametrically can be smaller compared with external two balls 33
Spacer.
Since bearing 31a, 31b are positioned against protruding portion 22, these bearings 31a, 31b is caused close to the SMA of the length section
Dynamic device line 40 exerts a force to the position of lens element 20, this facilitates limitation around the axis for being orthogonal to the plane comprising optical axis O
The rotation of line (that is, into the axis of (sideways) lateral in the axis and Fig. 4 of paper in Fig. 3).This is because when perpendicular to
When optical axis O is observed, compared with bearing 31a, the 31b for being located at farther place, by the SMA actuator line 40 and bearing of these length sections
The couple (couple) between power that 31a, 31b apply reduces.This effect in bearing 31a, 31b by being arranged multiple balls
34 improve, and which increase bearing 31a, 31b along the length of optical axis O.Therefore, dynamic tilt performance depends on bearing 31a, 31b
In two outer balls 34 spacing and bearing surface 32 and bearing surface 33 flatness.
The SMA actuator line 40 that other bearing 31c, 31d are positioned adjacent to these length sections is connected to the position of chassis 6.
Therefore, bearing 31c, 31d is provided to the limit rotated in the plane for being orthogonal to optical axis O around the axis close to compressed spring 11
System.Since the major function of other bearing 31c, 31d are to prevent this rotation, so other bearing 31c, 31d can be wrapped respectively
Include single ball 33.Lens element 20 is undesirable in the normal operation period around the rotation of the axis, but for control
Motorless fall event (unpowered drop events) is important.
Other two bearing 31c, 31d are needed, because in general, the protruding portion in the plane for being orthogonal to optical axis O
The permitted rotation of bearing 31a, 31b of positioning can occur in either direction.However, other bearing 31c, 31d must cloth
It is set to so that only having a ball in two balls 33 and is contacted with support construction 2 and lens element 20, be so as not to excessively limit
System.
Therefore, in the first bearing arrangement, four bearing 31a-31d are for preventing from rotating, but the design needs to have
There are several components of tight tolerance, so as to not assembling under by excessive the case where limiting.Second bearing arrangement and third
Bearing arrangement provides simplified design, and due to the number of components of reduction, simplification design provides loose tolerance and is easy to
Assembly.
The arrangement of second bearing shown in Fig. 5 only includes two bearings 31a, 31b.For corresponding in first bearing arrangement
Bearing 31a, 31b, when along optical axis O observation, these bearings 31a, 31b is located in the opposite side of protruding portion 22 against protruding portion 22
On, and including multiple balls 34, usually three balls 34.It is internal in the case where three or more ball 34 are arranged
Ball 34 is diametrically with external two balls 33 compared to can be smaller, and as spacer.In this way, these bearings 31a,
31b helps to limit the rotation around the axis for being orthogonal to the plane comprising optical axis O, and to the corresponding axis in first bearing arrangement
It holds 31a, 31b and is equally applicable to second bearing arrangement about the above-mentioned explanation of this effect.
However, compared with the first bearing arrangement for being limited in the plane internal rotation for being orthogonal to optical axis O, bearing 31a,
The bearing surface 32 and bearing surface 33 of 31b is changed.Particularly, in one in bearing 31a, the axis in support construction 2
Holding the bearing surface 33 on surface 32 and lens element 20 is individually groove.When ball 34 rolls, the groove of bearing surface 32
Each of and the groove of bearing surface 33 generate and contact with ball 34 along a pair of of parallel lines, which puts down each other
Row.
In another bearing 31b, however it remains the bearing surface 32 in support construction 2 is plane surface and lens element
The case where bearing surface 33 on 20 is groove (alternatively, however, the bearing surface 32 in support construction 2 can be groove,
And the bearing surface 33 on lens element 20 can be plane surface).
This asymmetric arrangement of bearing 31a, 31b limit lens element 20 and are directed in the plane for being orthogonal to optical axis O
Rotation movement.Conceptually, this limitation can pass through the bearing surface 32 and bearing surface 33 of consideration bearing 31a
On groove understand that the groove limits all freedom degrees other than pass around the rotation of axis of bearing 31a itself
Movement, the rotation itself limited by another bearing 31b.Because another bearing 31b includes the bearing surface of plane
33, so applying the constraint in the case where not limiting entire bearing arrangement excessively.
The arrangement of 3rd bearing shown in Fig. 6 only includes three bearing 31a-31c.As one in first bearing is arranged
Sample, when along optical axis O observation, two bearings 31a, 31b in these bearings are located in the phase of protruding portion 22 against protruding portion 22
On opposite side, and including multiple balls 34, usually three balls 34.In the case where three or more ball 34 are arranged,
Internal ball 34 is diametrically with external two balls 33 compared to can be smaller, and as spacer.In this way, these bearings
31a, 31b help to limit the rotation around the axis for being orthogonal to the plane comprising optical axis O, and to the phase in first bearing arrangement
Bearing 31a, 31b is answered to be equally applicable to 3rd bearing arrangement about the above-mentioned explanation of this effect.
However, two bearings 31a, 31b are asymmetric arrangements, so that they are orthogonal compared with first bearing arrangement
Couple is applied to lens element 2 in the plane of optical axis O.It can be any with the rotation in the plane for being orthogonal to optical axis O
On direction first bearing arrangement compares, by 3rd bearing arrange in two bearings 31a, 31b generate this couple be inclined to
Rotation on generation specific direction.Therefore, single other bearing 31c can be provided only to limit the rotation, bearing 31c
Being located in it against lens element 22 prevents the position of the rotation.Because the major function of another bearing 31c be prevent it is this
Rotation, so another bearing 31c may include single ball 33.
In another bearing 31c, the bearing surface 32 in support construction 2 is plane surface, and on lens element 20
Bearing surface 33 be that (alternatively, however, the bearing surface 32 in support construction 2 can be groove, and lens cells to groove
Bearing surface 33 on part 20 can be plane surface).In this way, can be applied in the case where not limiting entire bearing arrangement excessively
Add the limitation to rotation.
Although described above is rolling bearings 31, alternatively, rolling bearing 31 can be by sliding bearing
(plain bearings) is replaced.
In one example, the sliding bearing 41 of the illustrated first kind in Fig. 7 and Fig. 8 can be used.Sliding bearing
41 include the elongated bearing surface 43 on one in support construction 2 and lens element 20.Sliding bearing 41 further includes being formed
Protruding portion 45 on another in support construction 2 and lens element 20, the end of protruding portion 45, which is formed, is supported on elongated shaft
Hold the bearing surface 46 on surface 43.Although showing two protruding portions 45 in the example of fig. 8, it usually can be set and appoint
One or more protruding portions 45 for quantity of anticipating.Elongated bearing surface 43 and bearing surface 46 are conformal (conformal),
It is plane both in the example, to allow lens element 20 relative to the relative movement of support construction 2.It is desirable that elongated
Bearing surface 43 and bearing surface 46 have 0.2 or smaller coefficient of friction.
In another example, the sliding bearing 51 of Second Type shown in Fig. 9 and Figure 10 can be used.Sliding bearing
51 include the channel 52 on one in support construction 2 and lens element 20, and the inner surface in channel 52 forms bearing surface
53.Sliding bearing 51 includes the protruding portion 55 on another being formed in support construction 2 and lens element 20, protruding portion 55
End forms the bearing surface 56 being supported on bearing surface 53.Although showing two protruding portions 55 in this example,
Any number of one or more protruding portions 55 usually can be set.Elongated bearing surface 53 and bearing surface 56 are conformal
, the two is plane in this example, to allow lens element 20 relative to the relative movement of support construction 2.It is desirable that
Elongated bearing surface 53 and bearing surface 56 have 0.2 or smaller coefficient of friction.
In each of sliding bearing 41 and sliding bearing 51, the material of bearing surface 43,46,53,56 is chosen to
Smooth movement and long-life are provided.Bearing surface 43,46,53,56 can be integrated with the component of lower section, or can be by
Surface covering is formed.Suitable material includes for example, PTFE or other polymer bearing materials or metal.
May it is surprising that assume lens element 20 needs smoothly moved in its entire service life and without clamping stagnation
(sticking) it and skids (slipping), then sliding bearing can be adequately used for lens element 20 along the guiding of optical axis O
Mobile application.However, it has been found that sliding bearing by by bearing in the plane and perpendicular to the power being subjected on moving direction
Control fully plays a role in appropriate range.Therefore, compared with rolling bearing 31, sliding bearing can provide limitation
The similar functions of the movement in freedom degree other than along optical axis O, while reducing some problems or whole in the above problem
Problem, as described below.
Because number of components is reduced, the manufacture of SMA actuator device is simplified, and due to not having rolling bearing to grasp
Make, the assembly of bearing is easier to carry out.Similarly, eliminate rolling bearing component in use due to mechanical restriction is insufficient and from
The risk that bearing falls off.
In addition, the use of sliding bearing allows SMA actuation means to reduce along the height of optical axis, this is for camera and its
It is needed for the miniaturization of its optical device.Particularly, compared with the bearing for including rolling bearing component, bearing surface
Total height can reduce, while provide the dynamic tilt degree of needs.
More generally, rolling bearing 31 can also be replaced by any one of following kind of bearing: jewel bearing；Stream
Body bearing；Magnetic bearing；Flexible bearing；Or composite bearing.In addition, rolling bearing 31 can also be by rocker bearing or gantry post
Instead of wherein bearing element is pivoted or shaken in moving element and stationary element.
The 2nd SMA actuation means to the 4th SMA actuation means will now be described.2nd SMA actuation means to the 4th SMA cause
Each of dynamic device is the pattern of the change of the first SMA actuation means 1.Therefore, it will only describe to change, in addition the 2nd SMA
Actuation means have the structure of the first SMA actuation means 1 as described above to the 4th SMA actuation means.
The 2nd SMA actuation means 60 are shown in Figure 11.In the 2nd SMA actuation means 60, the first SMA actuation means 1
In the SMA actuator lines 40 of two length sections replaced by single straight SMA actuator line 61, the straight SMA actuator line 61
Crimping portion 62 by being fixed to protruding portion is connected to support construction 2, and the pressure contact portion by being fixed to lens holder 25
63 are divided to be connected to lens element 20.Crimping portion 62 and crimping portion 63 crimp SMA actuator line 61 with provide mechanical connection and
Both electrical connections.
SMA actuator line 61 have in the SMA actuator line 40 of the length section in the first SMA actuation means 1
One identical construction, therefore tilted relative to the plane for being orthogonal to optical axis O with the acute angle theta greater than 0 degree.
The manufacture of 2nd SMA actuation means 60 and the angled V-arrangement of the first SMA actuation means 1 and WO2007/113478
Both arrangements are compared and are simplified, because the SMA actuator line 61 of only single length section, and do not need to activate the SMA
Device line 61 is hooked on protruding portion 22.The inclination of SMA actuator line 61 maintains the advantages of gain for providing amount of movement, and has
Beneficial to making the 2nd SMA actuation means 60 along the minimized height of optical axis O.
When from use 2,4 or 8 SMA actuator lines known arrangement (its usually provide by different SMA actuator lines generate
Cross force some balances) compared to when, shape memory alloy actuator line 61 generates sizable cross force.However, passing through
Analysis and experiment are it has realized that it is surprising that can pass through suspension system 30 due to using the bearing of bearing 31 to arrange
Sufficiently offset these cross forces.
Method disclosed in WO2016/189314 can be used to execute in the assembly of 2nd SMA actuation means 60, for example,
As shown in Figure 12.This method uses strut members 65, which is configured to include sacrificing support-column main body
(sacrificial strut body) 66 and the crimping auricle 67 being held apart at by sacrifice support-column main body 66.
SMA actuator line 61 is placed with known tension, such as since spool, across crimping auricle 67, crimps ear
Piece 67 is folded and is pressed on SMA actuator line 61 by closure tool (not shown), keeps SMA actuator line 61 to be formed
Crimping portion 62 and crimping portion 63.Then, crimping portion 62 and crimping portion 63 be for example mechanically or bonding mode
It is attached respectively to support construction 2 and lens element 20.
Later, it removes and sacrifices support-column main body 66, leave the crimping portion for being attached respectively to support construction 2 and lens element 20
62 and crimping portion 63.
In the 2nd SMA actuation means 60, the both ends to SMA actuator line 61 is needed to be electrically connected.This connection
It is directly, because this is the position that flexible circuit board 8 is located at support construction 2.Connection at lens element 20 can be with
It carries out in any suitable manner, such as by flexible connector or passes through some other components of SMA actuation means 60, example
Such as compressed spring 11 or bool (if being used as suspension system 30).
Compared with the first SMA actuation means 1, the second actuation means 60 generate the power of half amount on the direction along optical axis O.
Generate the 3rd SMA actuation means 70 of power identical as the first SMA actuation means 1 in figure 13 illustrates.
In the 3rd SMA actuation means 70, single-piece SMA actuator over the projections is hooked in the first SMA actuation means 1
Line 41 is replaced by the SMA actuator line 71 of two length sections, and the SMA actuator line 71 of two length sections is protruded by being fixed to
The crimping portion 72 in portion 22 is connected respectively to support construction 2, and the crimping portion 73 by being fixed to lens holder 25 is respective
It is connected to lens element 20.Crimping portion 72 and crimping portion 73 crimp SMA actuator line 71 to provide mechanical connection and be electrically connected
Both connect.
Other than the connection type at protruding portion 22, the SMA actuator line 71 of two length sections has and the first SMA
The identical construction of SMA actuator line 40 of the length section in actuation means 1.Therefore, SMA actuator line 71 has
The angled V-arrangement arrangement of type is disclosed in WO2007/113478, as described below.
When along optical axis O observation, the SMA actuator line 71 of two length sections has 90 degree of angle between them,
Optical axis O is moving direction in the example.More generally, the orientation of the SMA actuator line 71 of these length sections can change, so that
Angle when along optical axis O observation between them has any size less than 180 degree, preferably in 70 degree to 110 degree of range
It is interior.
In addition, the SMA actuator line 71 of each length section relative to being orthogonal to the plane of optical axis O in a same direction and
With the inclination of identical acute angle theta, optical axis O is moving direction in this example.The SMA actuator line 71 of these length sections is also along optical axis
O is located at identical height.In this example, angle, θ is selected as relative to being orthogonal to the plane of moving direction 8 to 12
In the range of degree.This provides the advantage identical as this angle is used in the first SMA actuation means 1, and about first
The explanation of this respect of SMA actuation means 1 is equally applicable to the 3rd SMA actuation means 70.
Although this is not required, and angle, θ however, selected angle θ is advantageous within the scope of 8 degree to 12 degree
It can choose as the numerical value with other numerical value, such as more than 12 degree or more than 15 degree.
The manufacture of 2nd SMA actuation means 70 and the angled V-arrangement of the first SMA actuation means 1 and WO2007/113478
Both arrangements are compared and are simplified, because do not need for the SMA actuator line 71 of these length sections to be hooked on protruding portion 22, and
And crimping portion 73 can be each attached to protruding portion 22.The inclination of the SMA actuator line 71 of these length sections maintains offer
The advantages of gain of amount of movement, and it is beneficial to the minimized height for making the 3rd SMA actuation means 70 along optical axis O.
It in the 3rd SMA actuation means 70, is electrically connected to provide with the SMA actuator lines 71 of two length sections, electricity
Connector 78 is arranged on lens element 2, and electrical connection is formed between the SMA actuator line 71 of these length sections.In a type
In the embodiment of type, the SMA actuator line 71 and electric connector 78 of two length sections can be individually single-piece SMA actuator line
Part.In another type of embodiment, the SMA that the SMA actuator line 71 of two length sections can be discrete item is caused
Dynamic device line, and electric connector 78 can be individual component, such as the strip conductor or metal that are molded into lens holder 24
Element, the strip conductor or hardware connect two crimping portions 73, or are alternatively integral with crimping portion 73
Main body.Therefore, it can be carried out at support construction by crimping portion 72 and the electricity of the SMA actuator line 71 of two length sections
Connection, the electrical connection are directly, because this is the position that flexible circuit board 8 is located at.This allows long by concatenated two
The SMA actuator line 71 for spending section provides driving signal, without carrying out any electrical connection at lens element 20.
Method disclosed in WO2016/189314 can be used to execute in the assembly of 3rd SMA actuation means 70, for example,
As shown in Figure 12.
For the SMA actuator line 71 of each length section, individual strut members 75 are can be used in this method, then as above
Described in face, each length is assembled by executing the assembly method of solid wire 61 twice in the 2nd SMA actuating assembly 60
The SMA actuator line 71 of section.
Alternatively, single strut members 75 can be used in this method, which is configured to include sacrificing
The crimping auricle of support-column main body 76 and the SMA actuator line 71 for two length sections being held apart at by sacrifice support-column main body 76
77.Strut members 75 have 90 degree of bending at bending line 78, allow the SMA actuator line 71 of two length sections at it
Be attached in respective orientation.
The SMA actuator lines 71 of these length sections is placed with known tension, such as since spool, across crimping ear
Piece 77, crimping auricle 77 are folded and are pressed on the SMA actuator line 71 of these length sections by closure tool (not shown),
To form the crimping portion 72 and crimping portion 73 of the SMA actuator line 71 for keeping these length sections.The SMA of two length sections is caused
Dynamic device line 71 and electric connector 78 can be the part of single-piece SMA actuator line, or alternatively, the SMA of two length sections
Actuator line 71 can be the SMA actuator line 71 of discrete item, and electric connector 78 can be the part of strut members 75.
Then, crimping portion 72 and crimping portion 73 be for example mechanically or bonding mode is attached respectively to support knot
Structure 2 and lens element 20.
Later, it removes and sacrifices support-column main body 76, leave the crimping portion for being attached respectively to support construction 2 and lens element 20
72 and crimping portion 73.
3rd SMA actuation means 70 can be modified to change the construction or number of the SMA actuator line 71 of these length sections
Amount, including pass through unrestricted exemplary arrangement, in which: the parallel tilt length on the same side of SMA actuation means 70
The SMA actuator line 71 of section；The SMA actuator line of the intersection length section of reverse motions is provided on 70 side of SMA actuation means
71；Or the SMA actuator line 71 of two pairs of parallel length sections in the sides adjacent of SMA actuation means 70.
Two kinds of alternative forms of the 4th SMA actuation means 80 are shown in Figure 15 and Figure 16.
In the 4th SMA actuation means 80, the bearing arrangement for forming suspension system 30 is varied so that bearing 31 guides
The moving along moving direction M relative to support construction 2 of mirror element 20, the moving direction relative to lens element 20 optical axis O with
The first sharp angle α inclination greater than 0 degree.Therefore, the component for the transverse movement for allowing lens element 20 to have perpendicular to optical axis O.So
And this transverse movement may be acceptable in numerous applications.In addition, this, which has to reduce, passes through what suspension system 30 was transmitted
The advantages of the advantages of power and also reduction gain.
The second acute angles beta that the SMA actuator line 40 of these length sections is greater than the first sharp angle α relative to optical axis O tilts.This
Mean that the SMA actuator line 40 of these length sections is still tilted relative to moving direction M, but the SMA of these length sections is caused
Dynamic device line 40 reduces relative to the angle, θ of the normal of optical axis O.This allows to reduce the total height of the 4th SMA actuation means 80, simultaneously
It keeps the degree of stroke and keeps good control.In the 4th SMA actuation means 80, the SMA actuating of these length sections is determined
The critical angle of the performance of device line 40 is no longer the SMA actuator line 40 of these length sections and is orthogonal between the plane of optical axis O
Angle, θ, but the SMA actuator line 40 of these length sections and be orthogonal to movement of the lens element 20 relative to support construction 20
Angle γ between the plane of direction M.Therefore, the 4th SMA actuation means 80 are along the size of optical axis O no longer by these length sections
The limitation of SMA actuator line 40.
In first form of the 4th SMA actuation means 80 shown in fig.15, the SMA actuator line 40 of these length sections
Extend in the plane for being orthogonal to optical axis O.In this case, the SMA actuator line 40 of these length sections has throws along optical axis O
The minimum zone of shadow.
In the second form of the 4th SMA actuation means 80 shown in Figure 16, the SMA actuator line 40 of these length sections
Extended relative to the plane for being orthogonal to optical axis O with the angle, θ greater than 0 degree.In this case, the SMA actuating of these length sections
Device line 40 has the range projected along optical axis O, but this can be controlled by adjusting angle, θ, to cooperate in SMA actuation means
Some other components size limitation in.For example, along the SMA actuator line 40 of these length sections of optical axis O direction projection
It is same or less that range can be arranged to the range arranged with the bearing of the bearing 31 along optical axis O direction projection.
It will be understood by those skilled in the art that although have been described be considered as optimal mode foregoing teachings, and suitable
Other modes of this technology are executed in the case where, but this technology should not necessarily be limited by preferred embodiment disclosed in this specification
Specific configuration and method.Those skilled in the art will appreciate that this technology is with a wide range of applications, and do not departing from
In the case where any inventive concept as defined in the appended claims, embodiment can carry out the modification of wide scope.
Claims (11)
1. a kind of shape memory alloy actuation apparatus, comprising:
Support construction；
Displaceable element, through suspension system supports in the support construction, the suspension system includes bearing arrangement, institute
State bearing arrangement be arranged to the guiding displaceable element relative to the support construction moving along moving direction；
The shape memory alloy actuator line of at least one length section, is connected to the support construction and the displaceable element
Between, for driving the displaceable element relative to the movement of the support construction, wherein the shape memory of the length section
Alloy actuator line is relative to the plane for being orthogonal to the moving direction with the angle tilt in 5 to 15 degree ranges.
2. shape memory alloy actuation apparatus according to claim 1, wherein the bearing arrangement includes at least one rolling
Dynamic bearing, at least one described rolling bearing include the support construction and bearing surface on the displaceable element and set
Set at least one rolling bearing component between the bearing surface.
3. shape memory alloy actuation apparatus according to claim 2, wherein at least one of described bearing surface by
Metal is made.
4. shape memory alloy actuation apparatus according to claim 2, wherein the support construction and the removable member
At least one of part is molded element, and described in the support construction and the displaceable element is at least one
The bearing surface is the surface for the metal insert being arranged in the molded element.
5. shape memory alloy actuation apparatus according to claim 1, wherein the bearing arrangement includes at least one cunning
Dynamic bearing.
6. shape memory alloy actuation apparatus according to any one of claim 1 to 5, wherein the displaceable element
It is the lens element for including at least one lens.
7. shape memory alloy actuation apparatus according to claim 6, wherein at least one described lens are by glass system
At.
8. shape memory alloy actuation apparatus according to claim 6 or 7, wherein the moving direction is along the lens
The optical axis of element.
9. shape memory alloy actuation apparatus according to claim 8, wherein the support construction has mounted thereto
Imaging sensor, the lenticular element arrangement focuses in described image sensor at by image.
10. the shape memory alloy actuation apparatus according to any one of claim 6 to 9, wherein it is described at least one
Lens have the at most diameter of 20mm.
11. shape memory alloy actuation apparatus according to any one of claim 1 to 10, wherein the length section
Shape memory alloy actuator line is relative to the plane for being orthogonal to moving direction with the angle tilt in 8 to 12 degree ranges.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB1721716.7 | 2017-12-22 | ||
| GBGB1721716.7A GB201721716D0 (en) | 2017-12-22 | 2017-12-22 | Sma actuator |
| GB1810201.2A GB2569668C (en) | 2017-12-22 | 2018-06-21 | Shape memory alloy actuation apparatus |
| GBGB1810201.2 | 2018-06-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110007542A true CN110007542A (en) | 2019-07-12 |
| CN110007542B CN110007542B (en) | 2021-08-20 |
Family
ID=61131543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811543160.5A Active CN110007542B (en) | 2017-12-22 | 2018-12-17 | Shape memory alloy actuator |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110007542B (en) |
| GB (2) | GB201721716D0 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110703404A (en) * | 2019-09-11 | 2020-01-17 | 瑞声科技(新加坡)有限公司 | Lens module |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201800544D0 (en) * | 2018-01-12 | 2018-02-28 | Cambridge Mechatronics Ltd | Shape memory alloy actuator |
| US11194115B1 (en) | 2020-09-02 | 2021-12-07 | Hutchinson Technology Incorporated | Guided autofocus assembly |
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| JP2009122605A (en) * | 2007-11-19 | 2009-06-04 | Konica Minolta Opto Inc | Drive unit using shape memory alloy |
| US20100074607A1 (en) * | 2007-02-12 | 2010-03-25 | Richard Topliss | Shape memory alloy actuation apparatus |
| CN101896719A (en) * | 2007-10-30 | 2010-11-24 | 剑桥机电有限公司 | Shape memory alloy actuation apparatus |
| CN104204935A (en) * | 2012-02-16 | 2014-12-10 | 剑桥机电有限公司 | Shape memory alloy actuation apparatus |
| CN107111212A (en) * | 2014-11-12 | 2017-08-29 | 艾斯科技公司 | Camera module auto-focusing actuator and its control method |
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| CA2149849A1 (en) * | 1995-05-19 | 1996-11-20 | Vincent Hayward | Actuator |
| JP2004197572A (en) * | 2002-12-16 | 2004-07-15 | Hashimoto:Kk | Length energization variable alloy thin wire actuator |
| KR101893229B1 (en) * | 2010-08-09 | 2018-08-29 | 캠브리지 메카트로닉스 리미티드 | Camera apparatus |
| JP2013097357A (en) * | 2011-11-07 | 2013-05-20 | Konica Minolta Advanced Layers Inc | Drive unit |
| JP2014010380A (en) * | 2012-07-02 | 2014-01-20 | Panasonic Corp | Lens actuator |
| TWI546604B (en) * | 2012-07-05 | 2016-08-21 | 鴻海精密工業股份有限公司 | Actuator and camera module using same |
| TWI566026B (en) * | 2012-11-22 | 2017-01-11 | 鴻海精密工業股份有限公司 | Actuator and camera module using same |
| CN103837958A (en) * | 2012-11-23 | 2014-06-04 | 鸿富锦精密工业（深圳）有限公司 | Actuator and camera module provided with actuator |
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2017
- 2017-12-22 GB GBGB1721716.7A patent/GB201721716D0/en not_active Ceased
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2018
- 2018-06-21 GB GB1810201.2A patent/GB2569668C/en active Active
- 2018-12-17 CN CN201811543160.5A patent/CN110007542B/en active Active
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|---|---|---|---|---|
| US20100074607A1 (en) * | 2007-02-12 | 2010-03-25 | Richard Topliss | Shape memory alloy actuation apparatus |
| CN101896719A (en) * | 2007-10-30 | 2010-11-24 | 剑桥机电有限公司 | Shape memory alloy actuation apparatus |
| JP2009122605A (en) * | 2007-11-19 | 2009-06-04 | Konica Minolta Opto Inc | Drive unit using shape memory alloy |
| CN104204935A (en) * | 2012-02-16 | 2014-12-10 | 剑桥机电有限公司 | Shape memory alloy actuation apparatus |
| CN107111212A (en) * | 2014-11-12 | 2017-08-29 | 艾斯科技公司 | Camera module auto-focusing actuator and its control method |
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| CN110703404A (en) * | 2019-09-11 | 2020-01-17 | 瑞声科技(新加坡)有限公司 | Lens module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110007542B (en) | 2021-08-20 |
| GB2569668B (en) | 2020-05-20 |
| GB2569668A (en) | 2019-06-26 |
| GB2569668C (en) | 2022-01-26 |
| GB201721716D0 (en) | 2018-02-07 |
| GB201810201D0 (en) | 2018-08-08 |
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