CN102203654A - Drive device - Google Patents
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- CN102203654A CN102203654A CN2009801443292A CN200980144329A CN102203654A CN 102203654 A CN102203654 A CN 102203654A CN 2009801443292 A CN2009801443292 A CN 2009801443292A CN 200980144329 A CN200980144329 A CN 200980144329A CN 102203654 A CN102203654 A CN 102203654A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
- G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
- H02N2/021—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors using intermittent driving, e.g. step motors, piezoleg motors
- H02N2/025—Inertial sliding motors
Abstract
A drive device which can efficiently move a member to be driven and which is of low profile. A drive device (20) is provided with an electromechanical conversion element (441) having first and second end surfaces (441a, 441b) facing each other in the expanding and contracting direction of the element, a vibration and friction section (443) mounted to the second end surface (441b) of the electromechanical conversion element (441), a driven member frictionally joined to the vibration and friction section, and a frictional-force applying means (424) for generating frictional force between the vibration and friction section and the driven member. The driven member can move in the direction in which the electromechanical conversion element expands and contracts. The vibration and friction section (443) has, in the direction perpendicular to the expanding and contracting direction, a friction surface which is a first end surface (4431). The driven member includes a bar-like movement shaft (423) making sliding contact with the friction surface of the vibration and friction section. The frictional-force applying means (424) is mounted to a member (422) other than the vibration and friction section (443).
Description
Technical field
The present invention relates to drive unit, relate in particular to the drive unit that has used dynamo-electric conversion elements such as piezoelectric element.
Background technology
All the time, as the automatic focusing of video camera with driver or zoom driver, use linear actuators (linear actuator), this linearity execution unit has used dynamo-electric conversion elements (drive unit) such as piezoelectric element, electrostriction element, magnetostriction element.
No. 3218851 communique of Jap.P. (patent documentation 1) disclose possess dynamo-electric conversion element (piezoelectric element), with this electromechanics conversion element (piezoelectric element) knot be incorporated in driver part (driving shaft, vibration friction part) that the flexible direction of dynamo-electric conversion element (piezoelectric element) extends and with this driver part (vibration friction part) frictional engagement be driven parts (Zoom lens lens barrel).In this patent documentation 1 disclosed drive unit, the drive signal that is applied on the dynamo-electric conversion element (piezoelectric element) is studied, be driven parts (Zoom lens lens barrel) with driving.In the drive unit of patent documentation 1, driver part (vibration friction part) is clipped in is driven between parts and the friction plate.In other words, driver part (vibration friction part) connects and is driven between parts and the friction plate.Friction plate is pushed driver part (vibration friction part) by crimp spring to the direction that is clipped in and is driven between the parts.
In addition, TOHKEMY 2006-276741 communique (patent documentation 2) discloses Miniaturizable, assembling, and the strong optical module of anti-drop impact easily.This patent documentation 1 disclosed optical module possesses lens mount (being driven parts), lens mount supporter, piezoelectric element (dynamo-electric conversion element), guide plate (vibration friction part) and energizing spring.Lens mount (being driven parts) keeps lens and can move at the optical axis direction of lens.The lens mount supporter can be slidably supported lens mount at the optical axis direction of lens.Piezoelectric element (dynamo-electric conversion element) is applied in voltage in the rate of stretch mode different with contraction speed, and flexible at the optical axis direction of lens, and a side's of this flexible direction face is fixed on the lens mount supporter.Guide plate (vibration friction part) is the another side of the flexible direction of piezoelectric element (dynamo-electric conversion element) fixedly, is accompanied by the flexible of piezoelectric element (dynamo-electric conversion element) and can moves at the optical axis direction of lens.In addition, guide plate (vibration friction part) is connected to the outer peripheral face of lens mount (being driven parts) slidably.Energizing spring is pushed at least one direction the opposing party of the outer peripheral face of guide plate (vibration friction part) and lens mount (being driven parts).
Patent documentation 2 disclosed optical modules possess first and second parts of bearings that keeps piezoelectric element (dynamo-electric conversion element) slidably and play the effect of sliding bearing.First and second parts of bearings surrounds four sides of piezoelectric element (dynamo-electric conversion element).Guide plate (vibration friction part) is accompanied by the flexible of piezoelectric element (dynamo-electric conversion element) and moves at optical axis direction.The planar wall guiding lens mount (being driven parts) of scioptics frame (being driven parts) moves to optical axis direction.Guide plate is made of the parts of anti-L word shape.Guide plate (vibration friction part) constitutes by first guide plate that extends to optical axis direction with second guide plate that first guide plate is provided with orthogonally.The face on the side that is taken of bonding piezoelectric element on this second guide plate (dynamo-electric conversion element).First guide plate is clipped between the planar wall of second parts of bearings and lens mount (being driven parts), and first guide plate is connected on the planar wall slidably.Energizing spring is with first guide plate of guide plate (vibration friction part) elastomeric element to the reinforcing of lens mount (being driven parts) side by clutch shaft bearing parts, piezoelectric element (dynamo-electric conversion element) and second parts of bearings.Energizing spring is made of leaf spring etc.Energizing spring is fixed on the inwall of the drive containment portion of lens barrel (lens mount supporter).
And TOHKEMY 2007-49879 communique (patent documentation 3) discloses the driver that can carry out stable drive controlling.Patent documentation 3 disclosed drivers possess: dynamo-electric conversion element (piezoelectric element); Be installed in the driving friction means (driving shaft, vibration friction part) of side's side of the flexible direction of this electromechanics conversion element (piezoelectric element); Be driven parts (be connected and decide the journey piece) with this driving friction means cooperates; And be supported on this and be driven on the parts and driving the slide unit that slides on the friction means.Slide unit contacts with driving friction means face.Slide unit and boosting mechanism form as one, and this boosting mechanism is installed in to be driven on the parts and to making and is driven parts and drives the direction reinforcing that friction means cooperates.
TOHKEMY 2007-49880 communique (patent documentation 4) discloses the driver that improves the degree of freedom of shape.Patent documentation 4 disclosed drivers possess: dynamo-electric conversion element (piezoelectric element); Be fastened on the link of side's side of the flexible direction of this electromechanics conversion element (piezoelectric element); Fastening (installation) bar-shaped driving friction means (driving shaft, vibration friction part) on this link; And with this vibration friction part frictional engagement be driven parts (be connected and decide the journey piece).Promptly, in patent documentation 4 disclosed drivers, with dynamo-electric conversion element (piezoelectric element) with drive friction means (vibration friction part) and be connected by link.The flexible direction that drives friction part (vibration friction part) and dynamo-electric conversion element (piezoelectric element) disposes abreast.Link is that the center swing is supported freely with the application point that is arranged on dynamo-electric conversion element (piezoelectric element) and drive between the friction means (vibration friction part).Be provided with slide unit in the coupling part that is driven parts (connect decide journey piece) and driving friction means (driving shaft).Be equipped with by pressing spring being driven on the parts (connect decide journey piece).
In addition, TOHKEMY 2007-74889 communique (patent documentation 5) discloses and has alleviated driver part and be driven the friction of parts and make it stable and can be accurately and promptly be driven the drive unit that moves of parts.Patent documentation 5 disclosed drive units possess: dynamo-electric conversion element (piezoelectric element); Be installed in the driver part of side's side of the flexible direction of this electromechanics conversion element; And with the parts that are driven of this driver part (vibration friction part) frictional fit.Driver part (vibration friction part) is formed by graphite composites such as for example graphitic carbons.
In patent documentation 5 disclosed drive units, be driven parts and have V shape groove, driver part (vibration friction part) cooperates with this groove.Be driven parts and have leaf spring, driver part (vibration friction part) by this leaf spring to being driven the component side reinforcing.Perhaps, clamp driver part (vibration friction part) by the sliding part of cross section V word shape.
TOHKEMY 2007-181261 communique (patent documentation 6) disclose can miniaturization on the flexible direction of dynamo-electric conversion element driver element.Patent documentation 6 disclosed driver elements possess: the dynamo-electric conversion element (piezoelectric element) that stretches in prescribed direction by the input of electric power; Be fixed on the frictional fit parts (vibration friction part) on the end of flexible direction of this electromechanics conversion element (piezoelectric element); And with the parts that are driven of these frictional fit parts (vibration friction part) frictional fit.The frictional fit position that is driven parts constitutes column, the position of on the extended line of the flexible direction of slave electric transition element (piezoelectric element), departing from, and extend with flexible direction almost parallel ground.
In patent documentation 6 disclosed driver elements, be driven the frictional fit position of parts and the slipping plane of frictional fit parts (vibration friction part) and pass through elastomeric element sliding freely by reinforcing.The frictional fit position of frictional fit parts (vibration friction part) is to form around the mode on every side that is driven parts.Elastomeric element adopts the leaf spring of the コ word shape that disposes in the mode around frictional fit parts (vibration friction part), and constitutes by this leaf spring and apply acting force from the outside of frictional fit parts (vibration friction part) to being driven parts.Perhaps, constitute elastomeric element, and dispose this spring along the groove of the side that is formed at frictional fit parts (vibration friction part) by spring.
TOHKEMY 2007-306763 communique (patent documentation 7) discloses the piezoelectric actuator of excellent impact resistance of the mating part of driver part and moving-member.These patent documentation 7 disclosed piezoelectric actuators possess: piezoelectric element (dynamo-electric conversion element); Be connected with this piezoelectric element, elongated driver part (vibration friction part) in one direction; And the moving-member (being driven parts) that disposes slidably along the length direction of this driver part.From the direction observed cross section vertical with the length direction of driver part (vibration friction part), the slipping plane and with this slipping plane adjacent corner part bending that end face became relative of above-mentioned moving-member (being driven parts) with above-mentioned driver part (vibration friction part).
In these patent documentation 7 disclosed piezoelectric actuators, moving-member (being driven parts) possesses first and second auxiliary section.First auxiliary section has the roughly depressed part of U word shape, holds guide member in this depressed part.Second auxiliary section has the roughly depressed part of U word shape, holds driver part (vibration friction part) in this depressed part.Held in the depressed part of second auxiliary section under the state of driver part (vibration friction part), having roughly, the cooperation accessory of V word shape depressed part is capped.This cooperation accessory is by being installed in the leaf spring of the L shape on second auxiliary section, with the pressing force reinforcing of regulation with screw.
The prior art document:
Patent documentation
Patent documentation 1: No. 3218851 communique of Jap.P.;
Patent documentation 2: TOHKEMY 2006-276741 communique (paragraph 0015～0017, Fig. 1, Fig. 2);
Patent documentation 3: TOHKEMY 2007-49879 communique (paragraph 0027～0041, Fig. 4～Fig. 8);
Patent documentation 4: TOHKEMY 2007-49880 communique (paragraph 0018～0020, Fig. 2);
Patent documentation 5: TOHKEMY 2007-74889 communique (paragraph 0055,0086, Fig. 5, Figure 12);
Patent documentation 6: TOHKEMY 2007-181261 communique (paragraph 0017～0019, Fig. 3, Fig. 4);
Patent documentation 7: TOHKEMY 2007-306763 communique (paragraph 0028～0030, Fig. 2, Fig. 3).
Summary of the invention
Invent problem to be solved
In above-mentioned patent documentation 1～7 disclosed drive unit, the problem points that will illustrate below existing respectively.
In patent documentation 1 disclosed drive unit, because driver part (driving shaft, vibration friction part) extends in the flexible direction of dynamo-electric conversion element, therefore parts (Zoom lens lens barrel) are longer than being driven for driver part (driving shaft, vibration friction part), and run-off the straight easily moves back and forth because of driver part (driving shaft, vibration friction part).In addition, the displacement that is driven parts (Zoom lens lens barrel) is long more, and driver part (driving shaft, vibration friction part) is also long more, and unwanted vibration mode takes place easily.And, have frictional fit portion on the extended line of the joint portion of dynamo-electric conversion element and driver part (driving shaft, vibration friction part), therefore be not used in low level.
In patent documentation 2 disclosed optical modules, need possess first and second parts of bearings that keeps piezoelectricity sub-prime (dynamo-electric conversion element) slidably and play the effect of sliding bearing.Its result exists portion product number of packages to increase, the structure complicated problems that becomes.
In patent documentation 3 disclosed drivers, same with above-mentioned patent documentation 1 disclosed drive unit, drive friction means (vibration friction part) and extend in the flexible direction of dynamo-electric conversion element.Its result, it is longer than being driven parts to drive friction means (vibration friction part), because of driving friction means (vibration friction part) the easy run-off the straight that moves back and forth.In addition, the displacement that is driven parts is long more, driving friction means (vibration friction part) is also long more, and unwanted vibration mode takes place easily.And, in the prolongation of dynamo-electric conversion element and the joint portion that drives friction means (vibration friction part), have frictional fit portion, therefore be unfavorable for low level.
In patent documentation 4 disclosed drivers, dynamo-electric conversion element is connected by link with driving friction means (vibration friction part).Its result exists portion product number of packages to increase, the structure complicated problems that becomes.
In patent documentation 5 disclosed drive units, same with above-mentioned patent documentation 1 disclosed drive unit, driver part (vibration friction part) extends in the flexible direction of dynamo-electric conversion element.Its result, driver part (vibration friction part) is longer than being driven parts, because of driver part (vibration friction part) the easily run-off the straight that moves back and forth.In addition, the displacement that is driven parts is long more, driver part (vibration friction part) is also long more, and unwanted vibration mode takes place easily.And, in the prolongation of the joint portion of dynamo-electric conversion element and driver part (vibration friction part), have frictional fit portion, therefore be unfavorable for low level.
In patent documentation 6 disclosed driver elements, elastomeric element is installed on the frictional fit parts (vibration friction part).In this structure, dynamo-electric conversion element is being applied under the situation of HF voltage, elastomeric element resonance can become the frequency band that vibrates mutually with the position opposite with frictional fit parts (vibration friction part).Phasic difference between elastomeric element and the frictional fit parts (vibration friction part) becomes the main cause that the translational speed of the portion that is driven (moving-member) of frictional engagement reduces and causes the reversal development of moving direction.
In patent documentation 7 disclosed piezoelectric actuators, same with above-mentioned patent documentation 1 disclosed drive unit, drive friction means (vibration friction part) and extend in the flexible direction of piezoelectric element (dynamo-electric conversion element).Its result, driver part (vibration friction part) is longer than moving-member (being driven parts), because of driver part (vibration friction part) the easily run-off the straight that moves back and forth.In addition, the displacement of moving-member (being driven parts) is long more, driver part (vibration friction part) is also long more, and unwanted vibration mode takes place easily.And, in the prolongation of the joint portion of piezoelectric element (dynamo-electric conversion element) and driver part (vibration friction part), have frictional fit portion, therefore be unfavorable for low level.
Therefore, problem of the present invention provides a kind of can making and is driven the drive unit that parts move efficiently.
Other problem of the present invention provides a kind of drive unit that can realize low level.
Other problem of the present invention provides a kind of drive unit simple in structure.
Other purpose of the present invention is along with the progress of explanation can be clear gradually.
Be used to solve the method for problem
If the main points of the illustrative mode of the present invention are narrated, then can be regarded as, drive unit possesses: the dynamo-electric conversion element that has first and second end face respect to one another in flexible direction; Be installed in the vibration friction part on second end face of this electromechanics conversion element; The parts that are driven with this vibration friction part frictional engagement; And vibrating friction part and be driven the friction force applying mechanism that produces friction force between the parts.Being driven parts can move in the flexible direction of dynamo-electric conversion element.The illustrative mode according to the present invention, the vibration friction part with the direction of flexible direction quadrature on have rubbing surface as first end face.Be driven parts and comprise the bar-shaped shifting axle of rubbing surface sliding contact with the vibration friction part.The friction force applying mechanism is installed on the vibration friction part parts in addition.
Effect of the present invention is as follows.
In the present invention, since the vibration friction part with the direction of flexible direction quadrature on have rubbing surface as first end face, be driven parts and comprise the bar-shaped shifting axle of rubbing surface sliding contact with the vibration friction part, the friction force applying mechanism is installed on the parts of vibration beyond the friction part, therefore can make to be driven component efficiencies and to move well.
Description of drawings
Fig. 1 is the stereographic map of the drive unit of expression first embodiment of the present invention.
Fig. 2 is a stereographic map of observing the automatic focusing lens driving unit of drive unit shown in Figure 1 from right front oblique upper.
Fig. 3 is a stereographic map of observing the automatic focusing lens driving unit of Fig. 2 from right back oblique upper.
Fig. 4 is a stereographic map of observing the automatic focusing lens driving unit of Fig. 2 from right oblique upper.
Fig. 5 is the side view of the automatic focusing lens driving unit of Fig. 2.
Fig. 6 be with the automatic focusing lens driving unit of Fig. 2 the lens drive division with being driven the stereographic map that parts and spring are represented.
Fig. 7 is the oscillogram that is used to illustrate the electric current that is supplied to laminated piezoelectric element and occurs in the displacement on the superimposed elements.
Fig. 8 is a stereographic map of observing the drive unit (automatic focusing lens driving unit) of second embodiment of the present invention from right back oblique upper.
Fig. 9 is a stereographic map of observing the drive unit (automatic focusing lens driving unit) of the 3rd embodiment of the present invention from right front oblique upper.
Figure 10 is a stereographic map of observing the automatic focusing lens driving unit of Fig. 9 from right back oblique upper.
Figure 11 is a stereographic map of observing the automatic focusing lens driving unit of Fig. 9 from right oblique upper.
Embodiment
Below, with reference to accompanying drawing embodiments of the present invention are described.
Referring to figs. 1 through Fig. 6, the drive unit 20 of first embodiment of the present invention is described.Fig. 1 is the stereographic map of expression drive unit 20.Fig. 2 is a stereographic map of observing the automatic focusing lens driving unit 40 of drive unit 20 shown in Figure 1 from right front oblique upper.Fig. 3 is a stereographic map of observing the automatic focusing lens driving unit 40 of Fig. 2 from right back oblique upper.Fig. 4 is a stereographic map of observing automatic focusing lens driving unit 40 from right oblique upper.Fig. 5 is the side view of automatic focusing lens driving unit 40.Fig. 6 is with the stereographic map that is driven parts 423 and spring 424 expressions with the lens drive division 44 of automatic focusing lens driving unit 40.
To shown in Figure 6, use orthogonal coordinate system (X, Y, Z) as Fig. 1 here.To state shown in Figure 6, in orthogonal coordinate system (X, Y, Z), X-direction is represented fore-and-aft direction (depth direction) at Fig. 1, and Y direction is represented left and right directions (Width), and Z-direction is represented above-below direction (short transverse).
Illustrated drive unit 10 is for example as the lens drive division 44 of automatic focusing lens driving unit 40 and use.This occasion, to example shown in Figure 6, above-below direction Z is the optical axis O direction of lens at Fig. 1.
As shown in Figure 1, drive unit 20 possesses the casing (housing) 30 of the roughly rectangular shape that covers automatic focusing lens driver 40 described later.In other words, in casing (housing) 30, dispose automatic focusing lens driver 40.Casing (housing) 30 comprises upperside frame 32, underside frame 34, driver pedestal 36 and upside cover 38.Driver pedestal 36 is installed on the underside frame 34.On driver pedestal 36, be equipped with stationary parts described later (hammer) 442.It is the circular open 38a of central shaft that upside cover 38 has with the optical axis O of lens.
On the other hand, though not shown, be equipped with the imaging apparatus that is configured on the substrate at the central portion of underside frame 34.This imaging apparatus is taken the image of the body that is taken that utilizes moving lens (aftermentioned) imaging and is converted to electric signal.Imaging apparatus is by formations such as for example charge-coupled image sensor (CCD-charge coupled device) type imageing sensor, complementary metal oxide semiconductor (CMOS) (CMOS-complementary metal oxide semiconductor) type imageing sensors.
With reference to Fig. 2 to Fig. 4, in casing (housing) 30, the front side is provided with leading axle 39 (with reference to Fig. 9) leftward.This leading axle 39 extends abreast with optical axis O.Leading axle 39 is erect and is arranged on the underside frame 34 of casing (housing) 30.Promptly right inboard in the centre across the opposite side of optical axis O and leading axle 39, be provided with the parts 423 that are driven described later.In illustrated embodiment, be driven parts 423 and constitute by bar-shaped shifting axle.Shifting axle 423 also extends abreast with optical axis O.Promptly, leading axle 39 and shifting axle 423 are configured on the rotational symmetric position of optical axis.
Automatic focusing lens driver 40 is made of lens movable part 42 and lens drive division 44.Lens drive division 44 is at optical axis O direction support of lens movable part 42 and drive lens movable part 42 as described later slidably.
Lens movable part 42 comprises the lens drum (lens subassembly) 421 of maintenance as the automatic focusing lens AFL of moving lens.Lens drum (lens subassembly) 421 remains fixed in the movable lens barrel roughly cylindraceous (lens mount) 422.On the internal perisporium of lens mount 422, cut internal thread (not shown).On the other hand, on the periphery wall of lens drum 422, cut the external thread (diagram) that is threaded with above-mentioned internal thread.Therefore, want lens drum 421 is installed on the lens mount 422, by lens drum 421 relative lens mounts 422 are threaded around optical axis O rotation and along optical axis O direction, thereby lens drum 421 is contained in the lens mount 422, is bonded with each other by cementing agent etc. again.
Lens mount 422 upper end of front side leftward has first extension (first auxiliary section) 4221 that extends to the radial direction outside.First extension (first auxiliary section) 4221 has the depressed part 4221U at the roughly U of left open word shape, holds above-mentioned leading axle 39 in this depressed part 4221U.Lens mount 422 has a pair of second extension (second auxiliary section) 4222 that extends to the radial direction outside in right inboard.A pair of first extension (first auxiliary section) 4222 has the depressed part 4222U of the roughly U word shape that opens wide on the right side, holds and chimeric shifting axle 423 in these depressed parts 4222U.By this structure, lens movable part 42 can only move in optical axis O direction relative to casing (housing) 30.
This projection 424c by spring 424 near the direction of shifting axle 423 (the place ahead of fore-and-aft direction X to) reinforcing.Vibration friction part 443 described later is clamped between shifting axle 323 and each the projection 424c by its first and second end face 4431,4432.First and second end face 4431,4432 with the direction of optical axis O direction quadrature on toward each other.In other words, first and second end face 4431,4432 with the direction of the flexible direction quadrature of laminated piezoelectric element 441 described later on toward each other.And first end face 4331 works as rubbing surface as described later.
The lens movable part 42 that constitutes automatic focusing lens driving unit 40 of scioptics frame 422, lens drum (lens subassembly) 421, spring 424, shifting axle 423.As described later, on the rubbing surface 4431 of vibration friction part 443, be formed with the groove 4431a of cross section V word shape.
Then, the lens drive division 44 to automatic focusing lens driving unit 40 describes.Lens drive division 44 is by as dynamo-electric conversion element and the laminated piezoelectric element 441 of working, above-mentioned stationary parts (hammer) 442 and above-mentioned vibration friction part 443 constitute.
Laminated piezoelectric element 441 is gone up flexible in optical axis O direction (above-below direction Z).Laminated piezoelectric element 441 has the structure of stacked a plurality of piezoelectric layers on optical axis O direction.As shown in Figure 5, laminated piezoelectric element 441 has first end face (lower surface) 441a respect to one another and second end face (upper surface) 441b on flexible direction.Stationary parts (hammer) 442 utilizes bonding agent etc. to combine with first end face (lower surface) 441a of laminated piezoelectric element 441.The combination of laminated piezoelectric element 441 and stationary parts 442 is called piezoelectric unit.
Bar-shaped shifting axle 423 and vibration friction part 443 frictional engagement.On vibration friction part 443, in frictional engagement portion (rubbing surface) 4431 front end of fore-and-aft direction X, between this vibration friction part 443 and the bar-shaped shifting axle 423, be formed with the groove 4431a of cross section V word shape.
As mentioned above, lens movable part 44 possess be used for the vibration friction part 443 push the spring 424 of (reinforcing) with respect to bar-shaped shifting axle 423.Promptly, the first end 424a of spring 424 is fastened on the 3rd extension 4223, with the projection 424c that is installed on its second end 424b, generation will be vibrated the pressing force that friction part 443 is pushed to shifting axle 423.In other words, spring 424 passes through projection 424c (the second end 424b) to 443 reinforcings of vibration friction part, by shifting axle 423 and projection 424c clamping vibration friction part 443, thereby play a role as between rubbing surface 4431 that vibrates friction part 443 and shifting axle 423, applying the friction force applying mechanism (boosting mechanism) of friction force.
At vibration friction part 443, the groove 4431a that forms cross section V word shape goes up in the frictional engagement portion (rubbing surface 4431) between vibration friction part 443 and the shifting axle 423.Groove 4431a and two straight lines shifting axle 423 of cross section V word shape by vibration friction part 443 contact, thereby stable, the good friction-driven of repeatability of the contact condition that obtains frictional engagement portion (rubbing surface 4431), and have one of conduct improving shifting axle 423 mobile directly advance ambulant effect.And, wish that the angle of the groove 4431a of this cross section V word shape is spent to the scope of less than 180 degree 30.
With reference to Fig. 6 the effective length Ls of spring 424 is described.As shown in Figure 6, drive unit 10 can design the effective length Ls of spring 424 longer.Therefore, even the size of spring 424 and package size have deviation, also can reduce influence to load.Its result can reduce the aberrations in property of each product and makes drive unit 10.
Like this,, therefore,, not only can use metal, and promptly use synthetic resin, also can bring into play the sufficient elasticity effect as the material of spring 424 owing to the effective length Ls of spring 424 can be designed longer.
In addition, in the present embodiment, spring 424 is not mounted on the vibration friction part 443 and is mounted in lens movable part 42 sides.Like this, vibrate friction part 443 and spring 424, thereby can prevent to cause the resonance effect of spring 424 by separating.Therefore, the phase place of vibration friction part 443 and spring 424 can not reversed, and lens movable part 42 is moved expeditiously.And the direct of travel of lens movable part 42 also may be controlled to the direction of hope and advances.
To shown in Figure 5, lens drive division 44 and lens movable part 42 are with respect to optical axis O and row arrangement as Fig. 2.Therefore, can make automatic focusing lens driving unit 40 low levels.Its result, drive unit 20 also can low level.
Secondly, with reference to Fig. 7 electric current that is supplied to laminated piezoelectric element 441 and the displacement that occurs on the laminated piezoelectric element 441 are described.In addition, Fig. 7 is the identical member of the illustrated structure of Fig. 5 with No. 3218851 communique of above-mentioned patent documentation (patent documentation 1).Fig. 7 (A) expression utilizes driving circuit (not shown) to make the figure of the variation of the electric current that is supplied to laminated piezoelectric element 441, and Fig. 7 (B) is the figure of the displacement of expression laminated piezoelectric element 441.
Shown in Fig. 7 (A), on laminated piezoelectric element 441, alternately flow through certain electric current (negative direction promptly in the other direction) of big electric current (positive dirction is promptly along direction) and regulation.Under this situation, shown in Fig. 7 (B), laminated piezoelectric element 441 alternately produce the rapid displacement (stretching,s extension) corresponding with big electric current (positive dirction is promptly along direction) and with the corresponding displacement stably (contraction) of certain electric current (negative direction is an opposite direction).
Promptly, laminated piezoelectric element 441 is applied square wave electric current (Fig. 7 (A)), with respect to the wavy displacement (stretching) (Fig. 7 (B)) of laminated piezoelectric element 441 generation sawtooth.
Except Fig. 7,, the action of automatic focusing lens driving unit 40 (drive unit 10) is described also with reference to Fig. 2.At first, to make lens movable part 42 along the vertical direction the action of Z situation about moving downwards describe.
At first, shown in Fig. 7 (A), on laminated piezoelectric element 441, flow through the big electric current of the promptly suitable direction of positive dirction.This occasion, shown in Fig. 7 (B), laminated piezoelectric element 441 produces the stretching, extension displacement of thickness direction rapidly.Its result, vibration friction part 443 moves rapidly upward along optical axis O direction (above-below direction Z).At this moment, lens movable part 42 does not move.Its reason is, because its inertial force, the lens movable part overcomes the friction force between vibration friction part 443 and the bar-shaped shifting axle 423, in fact also rests on its position.
Secondly, shown in Fig. 7 (A), flowing through negative direction on laminated piezoelectric element 441 is reciprocal certain electric current.This occasion, laminated piezoelectric element 441 produce the contraction displacement of thickness direction reposefully.Its result, vibration friction part 443 slowly moves downwards along optical axis O direction (above-below direction Z).At this moment, in fact lens movable part 42 moves along optical axis O direction (above-below direction Z) downward direction with vibration friction part 443.Its reason is, vibration friction part 443 and bar-shaped shifting axle 423 utilize the friction force that the surface of contact (rubbing surface 4431) between them produced and combine.
Like this, laminated piezoelectric element 441 is alternately applied the big electric current of (positive dirction is promptly along direction) and certain electric current of (negative direction promptly in the other direction), laminated piezoelectric element 441 is alternately produced stretch displacement and shrink displacement, thereby lens mount 442 (lens drum 421) is moved downwards continuously along optical axis O direction (above-below direction Z).
Lens movable part 42 is moved upward along optical axis O direction (above-below direction Z).Otherwise, can realize with (positive dirction is promptly along direction) certain electric current by on laminated piezoelectric element 441, alternately flowing through (negative direction is promptly in the other direction) big electric current.
Below, laminated piezoelectric element 441 is described.Laminated piezoelectric element 441 forms rectangular shape, and this component size is 0.9[mm] * 0.9[mm] * 1.5[mm].Use the such low Qm material of PZT as piezoelectric.By with thickness 20[μ m] piezoelectric and thickness 2[μ m] alternately stacked 50 layers of internal electrodes with pectination, thereby make laminated piezoelectric element 441.And effective internal electrode of laminated piezoelectric element 441 is of a size of 0.6[mm] * 0.6[mm].In other words, on the periphery in the outside of the effective internal electrode that is positioned at laminated piezoelectric element 441, have wide 0.15[mm] the insensitive zone part (gap) of ring-type.
In Fig. 1 and even drive unit 20 shown in Figure 5, shifting axle 423 is split with lens mount (lens support body) 422, and together secured to one another, but also shifting axle 423 and lens mount (lens support body) 422 can be constituted one.In this case, lens mount (lens support) 422 constitutes with shifting axle 423 usefulness same materials.
With reference to Fig. 8 the drive unit 20A (automatic focusing lens driving unit 40A) of second embodiment of the present invention is described.Fig. 8 is a stereographic map of observing automatic focusing lens driving unit 40A from right back oblique upper.Illustrated automatic focusing lens driving unit 40A except as the spring 424 of afterburning parts to the different this point of the installation method of lens mount 422, have the structure identical and carry out identical action with automatic focusing lens driving unit shown in Figure 3 40.Therefore, for the same reference marks of part note that has with the same function of part shown in Figure 3, for the purpose of simplifying the description, below only difference is described.
In automatic focusing lens driving unit 40 shown in Figure 3, the first end 424a of spring 424 is fastened on the 3rd extension 4223 of lens mount 422 with bonding agent.
With respect to this, in automatic focusing lens driving unit 40A shown in Figure 8, the first end 424a of spring 424 utilizes screw 425 screw retention on the 3rd extension 4223 of lens mount 422.
Automatic focusing lens driving unit 40A shown in Figure 8 obviously also has the effect same with the automatic focusing lens driving unit 40 of the first above-mentioned embodiment.
With reference to Fig. 9 to Figure 11, the drive unit 20B (automatic focusing lens driving unit 40B) of the 3rd embodiment of the present invention is described.Fig. 9 is a stereographic map of observing automatic focusing lens driving unit 40B from right front oblique upper.Figure 10 is a stereographic map of observing automatic focusing lens driving unit 40B from right back oblique upper.Figure 11 is a stereographic map of observing automatic focusing lens driving unit 40B from right oblique upper.Illustrated automatic focusing lens driving unit 40B is except as the different this point in the installation position of the spring of afterburning parts, have with Fig. 2 to the identical structure of automatic focusing lens driving unit shown in Figure 4 40 and carry out identical action.Therefore, to spring note reference marks 444.Therefore, for having the same reference marks of part note to part identical functions shown in Figure 5, for the purpose of simplifying the description, below only difference is described with Fig. 1.In addition, the above-mentioned leading axle of reference marks 39 expressions.
To automatic focusing lens driving unit 40 shown in Figure 4, spring 424 is installed on the lens mount 422 at Fig. 2.Promptly, the first end 424a of spring 424 is fastened on the 3rd extension 4223 of lens mount 422 with bonding agent.Therefore, spring 424 is inscapes of lens moving part 42.
With respect to this, to automatic focusing lens driving unit 40B shown in Figure 11, spring 444 is installed on the housing 30 at Fig. 9.Therefore, spring 444 is inscapes of lens drive division 44.
If be described in detail, then the first end 444a of the spring 444 internal face 34a that is bonded in the underside frame 34 of housing 30 with bonding agent goes up and installs.On the other hand, the second end 444b of spring 444 is relative with the rubbing surface 4431 of vibration friction part 443 across shifting axle 423 in the centre.The rear that is provided with direction X forwards, backwards on the second end 444b of this spring 444 is to outstanding projection 444c.This projection 444c by spring 444 near the direction (rear of fore-and-aft direction X to) of the rubbing surface 4431 of vibration friction part 443 by afterburning.Shifting axle 423 is clamped between the rubbing surface 4431 and projection 444c of vibration friction part 443.
Like this, lens drive division 44 possess be used for bar-shaped shifting axle 423 with respect to the vibration friction part 443 push the spring 444 of (reinforcing).Promptly, the first end 444a of spring 444 is fastened on the internal face 34a of underside frame 34, produces the pressing force that shifting axle 423 is pushed to vibration friction part 443 with the projection 444c that is installed on its second end 444b.In other words, spring 444 passes through projection 444c (the second end 444b) to shifting axle 423 reinforcings, with vibration friction part 443 and projection 444c clamping shifting axle 423, thereby work as between rubbing surface 4431 that vibrates friction part 443 and shifting axle 423, applying the friction force applying mechanism (boosting mechanism) of friction force.
In this 3rd embodiment, spring 444 is not mounted on the vibration friction part 443 and is mounted in housing 30 sides.Like this, vibrate friction part 443 and spring 444, thereby can prevent to cause the resonance effect of spring 444 by separating.Therefore, the phase place of vibration friction part 443 and spring 444 can not reversed, and lens moving part 42 is moved efficiently.In addition, the travel direction of lens moving part 42 can also be controlled to be to the direction of hope and advance.
In the drive unit of the illustrative mode of the invention described above, preferably vibrate friction part has cross section V word shape at rubbing surface groove.The angle of the groove of V word shape wishes to spend to the scope of less than 180 degree 30.
According to first scheme of the present invention, drive unit possesses the lens mount that is fastened on the shifting axle or constitutes integratedly with shifting axle, and above-mentioned friction force applying mechanism is installed on the lens mount.The friction force applying mechanism also can be made of the afterburning parts that for example are installed on the lens mount.In this case, afterburning parts also can have: be installed in the first end on the lens mount; And the second end, the second end face butt of this second end and vibration friction part, this second end face and first end face are relative with the direction of flexible direction quadrature.Afterburning parts also can be made of the spring that for example first end is bonded on the lens mount.Also can replace said structure, afterburning parts are made of the spring that first end is screwed on lens mount.
According to alternative plan of the present invention, drive unit possesses the lens mount that is fastened on the shifting axle or constitutes integratedly with shifting axle; And the housing that holds this lens mount, above-mentioned friction force applying mechanism is installed on the housing.The friction force applying mechanism also can be made of the afterburning parts on the internal face that for example is installed in housing.In this case, afterburning parts also can have the first end on the internal face that is installed in housing; And in the centre across shifting axle with the vibration friction part the rubbing surface opposite second end.Afterburning parts also can be made of the spring that for example first end is bonded on the internal face of housing.
Abovely the present invention has been carried out special expression and be illustrated, but the present invention is not limited to these embodiments with reference to its embodiment.Those skilled in the art can be regarded as under the situation of the spirit and scope of the present invention of the protection domain defined that does not break away from technical scheme of the present invention, can carry out various changes aspect form and detailed content.For example, in the above-described embodiment, shifting axle forms cylindric, and certainly, the shape of shifting axle is not limited thereto.
The present invention advocates the preference based on Japan's patented claim of on November 6th, 2008 application 2008-284984 number, whole as a reference this literary composition of introducing of its disclosed content.
Claims (10)
1. a drive unit (20,20A, 20B) possesses:
The dynamo-electric conversion element (441) that has first and second end face respect to one another (441a, 441b) in flexible direction (Z);
Be installed in the vibration friction part (443) on above-mentioned second end face (441b) of this electromechanics conversion element;
With this vibration friction part frictional engagement be driven parts (423), this is driven parts (423) and can goes up in the flexible direction (Z) of above-mentioned dynamo-electric conversion element (441) and move; And
At above-mentioned vibration friction part and the above-mentioned friction force applying mechanism (424,444) that produces friction force that is driven between the parts, this drive unit is characterised in that,
Above-mentioned vibration friction part (443) with the direction of above-mentioned flexible direction (Z) quadrature on have rubbing surface as first end face (4431),
The above-mentioned parts that are driven comprise bar-shaped shifting axle (423) with the above-mentioned rubbing surface sliding contact of above-mentioned vibration friction part,
Above-mentioned friction force applying mechanism (424,444) is installed on above-mentioned vibration friction part (443) parts (422,30) in addition.
2. drive unit according to claim 1 is characterized in that,
Above-mentioned vibration friction part (443) has the groove (4431a) of cross section V word shape on above-mentioned rubbing surface (4431).
3. drive unit according to claim 2 is characterized in that,
The angle (4431a) of the groove of above-mentioned V word shape is spent to the scope of less than 180 degree 30.
4. according to each described drive unit in the claim 1～3, it is characterized in that,
Above-mentioned drive unit (10,10A) possesses the lens mount (422) that is fastened on that above-mentioned shifting axle (423) is gone up or constitutes integratedly with above-mentioned shifting axle (423),
Above-mentioned friction force applying mechanism (424) is installed on the said lens frame (422).
5. drive unit according to claim 4 is characterized in that,
Above-mentioned friction force applying mechanism is made of the afterburning parts (424) that are installed on the said lens frame (422),
Above-mentioned afterburning parts (424) have: be installed in the first end (424a) on the said lens frame (422); And the second end (424b), second end face (4432) butt of this second end (424b) and above-mentioned vibration friction part (443), this second end face (4432) and above-mentioned first end face (4431) are relative with the direction of above-mentioned flexible direction (Z) quadrature.
6. drive unit according to claim 5 is characterized in that,
Above-mentioned afterburning parts are made of the spring (424) that above-mentioned first end (424a) is bonded on the said lens frame (422).
7. drive unit according to claim 5 is characterized in that
Above-mentioned afterburning parts are made of with the spring (424) that screw (425) is fixed on the said lens frame (422) above-mentioned first end (424a).
8. according to each described drive unit in the claim 1～3, it is characterized in that
Above-mentioned drive unit (10B) possesses:
The lens mount (422) that is fastened on that above-mentioned shifting axle (423) is gone up or constitutes integratedly with above-mentioned shifting axle (423); And
The housing (30) that holds this lens mount,
Above-mentioned friction force applying mechanism (444) is installed on the above-mentioned housing (30).
9. drive unit according to claim 8 is characterized in that
Above-mentioned friction force applying mechanism is made of the afterburning parts (444) on the internal face that is installed in above-mentioned housing (30) (34a),
Above-mentioned afterburning parts (444) have the first end (444a) on the internal face (34a) that is installed in above-mentioned housing (30); In the centre across above-mentioned rubbing surface (4431) opposite second end (444b) of above-mentioned shifting axle (423) and above-mentioned vibration friction part (443).
10. drive unit according to claim 9 is characterized in that
The spring (444) that above-mentioned afterburning parts are bonded in by above-mentioned first end (444a) on the internal face (34a) of above-mentioned housing constitutes.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008-284984 | 2008-11-06 | ||
| JP2008284984A JP4844769B2 (en) | 2008-11-06 | 2008-11-06 | Drive device |
| PCT/JP2009/066727 WO2010052974A1 (en) | 2008-11-06 | 2009-09-28 | Drive device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102203654A true CN102203654A (en) | 2011-09-28 |
| CN102203654B CN102203654B (en) | 2013-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801443292A Active CN102203654B (en) | 2008-11-06 | 2009-09-28 | Drive device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4844769B2 (en) |
| CN (1) | CN102203654B (en) |
| WO (1) | WO2010052974A1 (en) |
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| JP5531184B2 (en) * | 2010-06-17 | 2014-06-25 | 新シコー科技株式会社 | LENS DRIVE DEVICE, CAMERA, AND MOBILE TERMINAL DEVICE WITH CAMERA |
| WO2014049962A1 (en) * | 2012-09-28 | 2014-04-03 | コニカミノルタ株式会社 | Actuator unit and imaging device |
| WO2014049960A1 (en) * | 2012-09-28 | 2014-04-03 | コニカミノルタ株式会社 | Drive device and imaging device using same |
| WO2014049961A1 (en) * | 2012-09-28 | 2014-04-03 | コニカミノルタ株式会社 | Actuator unit for driving imaging lens, and imaging device |
| JP5618028B2 (en) * | 2012-10-19 | 2014-11-05 | コニカミノルタ株式会社 | Driving device and imaging device |
| WO2014061194A1 (en) * | 2012-10-19 | 2014-04-24 | コニカミノルタ株式会社 | Drive device and imaging device |
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| JP2007181261A (en) * | 2005-12-27 | 2007-07-12 | Kyocera Corp | Drive unit and camera module |
| US20070229702A1 (en) * | 2004-10-20 | 2007-10-04 | Kyocera Corporaton | Camera Module, and Portable Terminal and Information Terminal with the Same |
| US20070228883A1 (en) * | 2006-03-30 | 2007-10-04 | Fujinon Corporation | Driving apparatus |
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| JP3454026B2 (en) * | 1996-07-05 | 2003-10-06 | ミノルタ株式会社 | Driving device using electromechanical transducer |
| JP4616693B2 (en) * | 2005-04-28 | 2011-01-19 | 太陽誘電株式会社 | Driving device and driving method thereof |
| JP2007129795A (en) * | 2005-11-01 | 2007-05-24 | Konica Minolta Opto Inc | Driver |
| JP3793568B1 (en) * | 2006-01-17 | 2006-07-05 | 京セラ株式会社 | Camera module and information terminal equipped with the camera module |
| JP4984673B2 (en) * | 2006-06-22 | 2012-07-25 | 日産自動車株式会社 | Drive device |
-
2008
- 2008-11-06 JP JP2008284984A patent/JP4844769B2/en not_active Expired - Fee Related
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2009
- 2009-09-28 WO PCT/JP2009/066727 patent/WO2010052974A1/en active Application Filing
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070229702A1 (en) * | 2004-10-20 | 2007-10-04 | Kyocera Corporaton | Camera Module, and Portable Terminal and Information Terminal with the Same |
| JP2007181261A (en) * | 2005-12-27 | 2007-07-12 | Kyocera Corp | Drive unit and camera module |
| US20070228883A1 (en) * | 2006-03-30 | 2007-10-04 | Fujinon Corporation | Driving apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2010113106A (en) | 2010-05-20 |
| CN102203654B (en) | 2013-11-13 |
| WO2010052974A1 (en) | 2010-05-14 |
| JP4844769B2 (en) | 2011-12-28 |
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