CN101350572A - Driving apparatus, and manufacturing method of the same - Google Patents
Driving apparatus, and manufacturing method of the same Download PDFInfo
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- CN101350572A CN101350572A CNA2008101102859A CN200810110285A CN101350572A CN 101350572 A CN101350572 A CN 101350572A CN A2008101102859 A CNA2008101102859 A CN A2008101102859A CN 200810110285 A CN200810110285 A CN 200810110285A CN 101350572 A CN101350572 A CN 101350572A
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Abstract
A driving apparatus of the invention comprising an electromechanical conversion element that expands and contracts in an extending direction of a given fiducial line; a driving shaft mounted on one end of the electromechanical conversion element in the extending direction; a driven member frictionally engaged with the driving shaft; a holder that supports the electromechanical conversion element and comprises a bearing portion for the driving shaft. A first driving device further comprises an adjusting mechanism, disposed in the bearing portion, that adjusts inclination of the driving shaft with respect to the fiducial line. A second driving device further comprises a bearing member, disposed in the bearing portion, that comprises fixing portion fixed on the holder and an embedding portion embedded in a hollow portion formed on at least one end of the driving shaft. A third driving device further comprises a limitation member disposed on the bearing portion and limiting inclination of the driving shaft relative to the fiducial line.
Description
Technical field
The present invention relates to a kind of for example being adapted at the drive unit and the manufacture method thereof that drive lens etc. in camera phones or the small digital cameras etc.
Background technology
As the drive unit of in the past above-mentioned technical field, known drive unit possesses to the flexible dynamo-electric conversion element of the bearing of trend of stipulated standard line; Be installed in the driving shaft of an end of the dynamo-electric conversion element on the bearing of trend of stipulated standard line; The driven member of friction apply on driving shaft; Support dynamo-electric conversion element and have the support (for example opening 2002-142470 communique, Japan Patent spy with reference to the Japan Patent spy opens 2007-74889 communique, Japanese patent laid-open 10-337055 communique, Japan Patent spy and open the 2006-311794 communique) of the dead eye of driving shaft.
In aforesaid drive unit, the driving pulse that will have the zigzag waveform is applied on the dynamo-electric conversion element, makes dynamo-electric conversion element with the state distortion different with contraction speed of elongation speed.And if dynamo-electric conversion element is out of shape with jogging speed, then driven member is static with respect to driving shaft because of friction, and on the contrary, if dynamo-electric conversion element is out of shape with fast speed, then driven member moves with respect to driving shaft because of inertia.Thereby, be applied to repeatedly on the dynamo-electric conversion element by the driving pulse that will have the zigzag waveform, driven member is intermittently moved with trickle spacing.
Yet, when making above-mentioned drive unit, owing between the inner surface of the outer surface of driving shaft and dead eye, have the gap, therefore, exist under the state that the relative stipulated standard line of driving shaft topples over, be used for dynamo-electric conversion element is bearing in the misgivings of the binding agent sclerosis of support.Especially, when driving lens etc. in band camera phones or small digital cameras, require high optical property, therefore, driving shaft is toppled over respect to the stipulated standard line, even toppling over slightly also becomes deep problem.
Summary of the invention
So the present invention proposes in view of the above problems, its purpose is, a kind of drive unit of toppling over and manufacture method thereof that prevents driving shaft with respect to the stipulated standard line is provided.
In order to achieve the above object, first drive unit of the present invention is characterized in that, possesses dynamo-electric conversion element flexible on the bearing of trend of the datum line of stipulating; Be installed in the driving shaft of an end of the dynamo-electric conversion element on the bearing of trend; The driven member of friction apply on driving shaft; Support dynamo-electric conversion element and have the support of the bearing portion of driving shaft; Be located at bearing portion and adjust the tilt adjusting mechanism of driving shaft with respect to the inclination of datum line.
In this drive unit, use tilt adjusting mechanism, can adjust the inclination of driving shaft with respect to the datum line of regulation.For this reason, when making drive unit, even dynamo-electric conversion element under the state that driving shaft is toppled over respect to the datum line of regulation by bracket supports, also can revise toppling over of driving shaft.
In first drive unit involved in the present invention, dynamo-electric conversion element is preferably supported by rack elasticity.At this moment, driving shaft is with respect to the easy adjustment of toppling over of stipulated standard line, and simultaneously, the stress that is created in dynamo-electric conversion element after the adjustment is alleviated.
In first drive unit involved in the present invention, tilt adjusting mechanism has: first columnar portion, and it is entrenched in, and to have with the datum line be the fitting portion that center line is formed on the inner surface on the support; And second columnar portion, it is entrenched in the hollow bulb of at least one end that is formed at driving shaft, and the second center line off-centre of first center line of first columnar portion and second columnar portion also can.Perhaps, tilt adjusting mechanism has: columnar portion, and it is entrenched in, and to have with the datum line be that center line is formed on the fitting portion on the inner surface of support; And cylindrical portion, an end of its chimeric driving shaft, and the second center line off-centre of first center line of columnar portion and cylindrical portion also can.In these cases, be entrenched in by making that to have with the stipulated standard line be the columnar portion rotation that center line is formed on the fitting portion on the inner surface of support, can be easily and adjust the inclination of driving shaft reliably with respect to datum line.
In addition, for reaching above-mentioned purpose, the invention provides a kind of manufacture method of drive unit, drive unit possesses: dynamo-electric conversion element, and it is flexible on the bearing of trend of the datum line of regulation; Driving shaft, it is installed in an end of the dynamo-electric conversion element on the bearing of trend; Driven member, its friction apply is on driving shaft; Support, it supports dynamo-electric conversion element, and the manufacture method of drive unit is characterised in that, is included in to be used for dynamo-electric conversion element is bearing in before the binding agent sclerosis on the support, adjusts the operation of driving shaft with respect to the inclination of datum line.
In the manufacture method of this drive unit, before the binding agent sclerosis that is used for dynamo-electric conversion element is bearing on the support, driving shaft obtains adjusting with respect to the inclination of datum line.For this reason, can under the state of toppling over of driving shaft with respect to the stipulated standard line dynamo-electric conversion element be bearing on the support having prevented.
For reaching above-mentioned purpose, second drive unit involved in the present invention is characterized in that possessing: dynamo-electric conversion element, and flexible on the bearing of trend of the datum line of its three regulations; Driving shaft, it is installed in an end of the dynamo-electric conversion element on the bearing of trend; Driven member, its friction apply is on driving shaft; Support, it supports dynamo-electric conversion element, has the bearing portion of driving shaft simultaneously; Support unit, it is located at bearing portion, has the fitting portion that is fixed on the fixed part on the support and is entrenched in the hollow bulb of at least one end that is formed at driving shaft simultaneously.
In this drive unit, the fixed part that is located at the support unit in the bearing portion of driving shaft is fixed on the support, and the fitting portion of this support unit is entrenched in the hollow bulb at least one end that is formed at driving shaft.Thus, for example with only compare, can grow and obtain based on the support zone of fitting portion to driving shaft with the situation of dead eye supporting driving shaft.Thereby, can prevent that dynamo-electric conversion element is by bracket supports under the state that driving shaft is toppled over respect to the datum line of regulation.
In second drive unit involved in the present invention, the either party among the end of the holding section the when other end of the holding section the when other end of fitting portion preferably moves to a side end with the holding section of the driven member of friction apply on driving shaft and holding section move to the opposite side end compares and more is positioned at the opposing party's side.When driving shaft is subjected to impacting owing to landing waits, exist following misgivings: an end of the holding section the when other end of the holding section when moving to a side end in the holding section or holding section move to the opposite side end, stress concentrate on the driving shaft and make the driving shaft fracture.Therefore, the other end at fitting portion, when the either party among one end of the holding section the when other end of the holding section when moving to a side end with the holding section and holding section move to the opposite side end compares and more is positioned at the opposing party's side, fitting portion becomes the core of the driving shaft at hollow bulb place, when being subjected to impacting, can prevent the driving shaft fracture because of landing etc.
In second drive unit involved in the present invention, be formed with the notch part that extends at bearing of trend at the outer surface of fitting portion, make driving shaft be supported by fitting portion at least 3 places.Perhaps, also can be formed with the notch part that on bearing of trend, extends, make driving shaft be supported by fitting portion at least 3 places at the inner surface of the hollow bulb of driving shaft.In these cases, because the contact area of the inner surface of the hollow bulb of the outer surface of fitting portion and driving shaft diminishes, therefore, driving shaft is come and gone sleekly with respect to fitting portion move.And, being supported by fitting portion at least 3 places by driving shaft, therefore the relative fitting portion of driving shaft and being positioned, can prevent driving shaft toppling over respect to the stipulated standard line reliably.
For reaching above-mentioned purpose, the 3rd drive unit involved in the present invention is characterized in that it possesses: dynamo-electric conversion element, and it is flexible on the bearing of trend of the datum line of regulation; Driving shaft, it is installed in an end of the dynamo-electric conversion element on the bearing of trend; Driven member, its friction apply is on driving shaft; Support, it supports dynamo-electric conversion element, has the bearing portion of driving shaft simultaneously; Limiting part, it is located at bearing portion and limits the inclination of driving shaft with respect to datum line.
In this drive unit, by being located at the limiting part in the bearing portion that support has, restriction driving shaft toppling over respect to the stipulated standard line.Therefore, can prevent that dynamo-electric conversion element is by bracket supports under the state that driving shaft has been toppled over respect to the datum line of regulation.
In the 3rd drive unit involved in the present invention, limiting part is preferably mounted at the open side of the bearing portion on the support that is formed on as ditch.At this moment, driving shaft can be configured in the bearing portion that is formed on as ditch on the support from its open side, afterwards, limiting part be installed in the open side of bearing portion.Thereby can improve the assembleability of drive unit.
In the 3rd drive unit involved in the present invention, limiting part preferably have the fixed part that is fixed on the support and with driving shaft by the press section that is pressed in bearing portion inner surface, driving shaft in bearing portion at least 3 places by the inner surface of bearing portion and press section supporting.As mentioned above, driving shaft is pushed the press section supporting of face within it at least 3 places by the inner surface of bearing portion and with driving shaft, and thus, driving shaft is positioned.Therefore, can further prevent driving shaft toppling over reliably with respect to the stipulated standard line.
At this moment, the press section can be the screw that is screwed on the fixed part, perhaps, also can be the spring that is installed on the fixed part.When being screw, can adjust the pressing force of driving shaft by its situation of tightening with respect to bearing portion inner surface in the press section.In addition, when being spring, can adjust the pressing force of driving shaft by changing its spring constant with respect to bearing portion inner surface in the press section.
The invention effect
According to the present invention, can prevent driving shaft toppling over respect to the stipulated standard line.
Description of drawings
Figure 1A is the stereogram of first execution mode of expression drive unit involved in the present invention.
Figure 1B is the stereogram of second execution mode of expression drive unit involved in the present invention.
Fig. 1 C is the stereogram of the 3rd execution mode of expression drive unit involved in the present invention.
Fig. 2 A is the profile along the part of the II-II line shown in Figure 1A.
Fig. 2 B is the profile along the part of the II-II line shown in Figure 1B.
Fig. 2 C is the profile along the part of the II-II line shown in Fig. 1 C.
Fig. 3 is the stereogram of the tilt adjusting mechanism shown in Figure 1A.
Fig. 4 is the circuit diagram that makes the drive circuit of the piezoelectric element running shown in Figure 1A, 1B and the 1C.
Fig. 5 is the oscillogram that inputs to the input signal of drive circuit shown in Figure 4.
Fig. 6 is the oscillogram from the output signal of drive circuit output shown in Figure 4.
Fig. 7 is the part sectioned view of another execution mode of first execution mode of expression drive unit involved in the present invention.
Fig. 8 is the stereogram of tilt adjusting mechanism shown in Figure 7.
Fig. 9 is the longitudinal sectional drawing of the holding section of the lens-mount shown in Fig. 2 B.
Figure 10 is the longitudinal sectional drawing of holding section of lens-mount of other execution modes of second execution mode of drive unit involved in the present invention.
Figure 11 is the longitudinal sectional drawing of holding section of lens-mount of other execution modes of second execution mode of drive unit involved in the present invention.
Figure 12 is the longitudinal sectional drawing of holding section of lens-mount of other execution modes of second execution mode of drive unit involved in the present invention.
Figure 13 is near the front view the bearing ditch shown in Fig. 1 C.
Figure 14 is near the front view the bearing ditch of other execution modes of the 3rd execution mode of drive unit involved in the present invention.
Figure 15 is near the front view the bearing ditch of other execution modes of the 3rd execution mode of drive unit involved in the present invention.
Figure 16 is near the front view the bearing ditch of other execution modes of the 3rd execution mode of drive unit involved in the present invention.
Embodiment
Below, the preferred forms that present invention will be described in detail with reference to the accompanying.Need to prove that same or appropriate section is enclosed prosign in each figure, omit repeat specification.
Figure 1A is the stereogram of first execution mode of expression drive unit involved in the present invention, and Fig. 2 A is the part sectioned view along the II-II line shown in Figure 1A.Figure 1B is the stereogram of second execution mode of expression drive unit involved in the present invention, and Fig. 2 B is the part sectioned view along the II-II line shown in Figure 1B.Fig. 1 C is the stereogram of the 3rd execution mode of expression drive unit involved in the present invention, and Fig. 2 C is the part sectioned view along the II-II line shown in Fig. 1 C.Shown in Figure 1A, 2A, 1B, 2B, 1C, 2C, the drive unit 1 of first execution mode, the drive unit 10 of second execution mode and the drive unit 100 of the 3rd execution mode, be the device that is used for driving the lens of lens-mount (driven member) 2 maintenances, for example be applicable to band camera phones or small digital cameras etc. along optical axis OA.
One end of the piezoelectric element 4 on the bearing of trend of datum line FL in the mode of extending along datum line FL, is fixed with driving shaft 6 (in first and second execution mode, the driving shaft 6 of hollow is fixing by binding agent 7) by binding agent.The blacklead complex that driving shaft 6 is for example formed by compound strongly blacklead crystallizations such as graphitic carbons forms cylindricly in first and second execution mode, forms cylindric in the 3rd execution mode.On the other hand, the other end of the piezoelectric element 4 on the bearing of trend of datum line FL is fixed with hammer parts 8 by binding agent.Hammer parts 8 are to be used for loading by the other end of giving piezoelectric element 4, and prevent that the other end is than the bigger displacement of an end in piezoelectric element 4.As hammer parts 8,, preferably big than driving shaft 6 quality for the flexible of piezoelectric element 4 is conveyed to driving shaft 6 effectively.
In first and second execution mode, a tip clearance of driving shaft 6 is engaged in dead eye (bearing portion) 11a that is formed on the isolation part 11 that support 3 had.On the other hand, the logical through hole 12a that is formed on the isolation part 12 that support 3 had is inserted in the other end of driving shaft 6.Thus, driving shaft 6 can come and go along datum line FL and move.
In the 3rd execution mode, an end of driving shaft 6 is configured in bearing ditch (bearing portion) 211a that is formed on the isolation part 211 that support 3 had.On the other hand, the other end of driving shaft 6 is configured in bearing ditch (bearing portion) 212a that is formed on the isolation part 212 that support 3 had.Thus, driving shaft 6 can come and go along datum line FL and move.
Friction apply has the holding section 2a by the lens-mount 2 of isolation part 11 (211), 12 (212) restrictions moving area therebetween on driving shaft 6.Particularly, be fixed in the plate member 13 of section V word shape of holding section 2a and the flat spring 14 by being stuck the 2a of portion engaging by the plate member 15 clamping driving shafts 6 of the application of force to the section V of plate member 13 sides word shape, the mode that produces certain frictional force when thus, holding section 2a moves with it is installed on the driving shaft 6.Need to prove the axle 9 in the bearing of trend of support 3 upper edge datum line FL sets up the ditch that is configured in the section U word shape that lens-mount 2 had.That is, driving shaft 6 also works as the leading axle of lens-mount 2, and the axle 9 spline axles as lens-mount 2 work.
In the first embodiment, shown in Figure 1A and Fig. 2 A, 11 dead eye 11a is provided with and adjusts the tilt adjusting mechanism 20 of driving shaft 6 with respect to the inclination of datum line FL in the isolation part.Tilt adjusting mechanism 20 has: columnar portion (first columnar portion) 21, and it is interference fitted in from side's side, and to have with datum line FL be on the fitting portion 11b of the center line inner surface 11c that is formed on isolation part 11; And columnar portion (second columnar portion) 22, it is engaged on the hollow bulb 6a of driving shaft 6 from side's side clearance.Between an end face of the other end of columnar portion 21 and driving shaft 6, be provided with the gap, make them when piezoelectric element 4 maximum extensions, also not contact.Tilt adjusting mechanism 20 is formed on ditch 21a on the columnar portion 21 etc. by utilization, can be the center line rotation with datum line FL.Need to prove, as shown in Figure 3, center line (second center line) CL2 of the center line of columnar portion 21 (first center line) CL1 and columnar portion 22, an off-centre is 1/100mm for example.
As in the drive unit 1 of above formation, in tilt adjusting mechanism 20, centre line C L 2 off-centre of the centre line C L 1 of columnar portion 21 and columnar portion 22.For this reason, be center line and chimeric columnar portion 21 rotations on the fitting portion 11b of the inner surface 11c that forms on the isolation part 11 by making having with datum line FL, can be easily and adjust the inclination of driving shaft 6 reliably with respect to datum line FL.Thereby, when making drive unit 1, both having made under the state that driving shaft 6 relative datum line FL topple over, piezoelectric element 4 is supported by support 3, but also toppling over of revisal driving shaft 6.Thus, when in for example being with camera phones or small digital cameras etc., driving lens etc., can obtain high optical property.Need to prove,, then can keep the state of toppling over of driving shaft 6 of having adjusted with respect to datum line FL if after having revised the toppling over of driving shaft 6, columnar portion 21 is bonded and fixed on the support 3.
Further,, therefore, the axle 9 spline axles as lens-mount 2 only are set owing to can use tilt adjusting mechanism 20 to adjust driving shafts 6 with respect to the toppling over of datum line FL, can be with the leading axle of driving shaft 6 as lens-mount 2.Thus, not be used in the leading axle that lens-mount 2 is set outside the driving shaft 6 separately, for example in band camera phones or small digital cameras etc., during driving lens etc., can also prevent the deterioration of optical property.
In addition, piezoelectric element 4 passes through silicone cap sleeve 5 by support 3 elastic bearings.Therefore, driving shaft 6 is adjusted easily with respect to the inclination of datum line FL, and the stress that is created on the piezoelectric element 4 after adjusting is simultaneously alleviated.Need to prove that as the hardness (for example hardness of silicone cap sleeve 5) that makes piezoelectric element 4 elastic bearings when the support 3, preferred Shore hardness is below A90, more preferably Shore hardness is A20～60.
Yet, when making drive unit 1, also can adjust the inclination of driving shaft 6 being used to make before piezoelectric element 4 is bearing in (that is, being used for keeping the silicone cap sleeve 5 of piezoelectric element 4 to be bonded on the support 3) silicone adhesive sclerosis on the support 3 with respect to datum line FL.According to the manufacture method of above-mentioned drive unit 1, can prevent under the state of toppling over of driving shaft 6 with respect to datum line FL piezoelectric element 4 to be bearing on the support 3.And, the manufacture method of above-mentioned drive unit 1, even be not elastic binder as silicone adhesive, and also effective when becoming the binding agent of high rigidity when being to use sclerosis.
In second execution mode, shown in Figure 1B and Fig. 2 B, on the dead eye 11a of isolation part 11, be provided with the support unit 120 of supporting driving shaft 6.Support unit 120 has the fitting portion 122 on fixed part 121 that is fixed on the rectangular plate shape on the support 3 and the hollow bulb 6a that is engaged in driving shaft 6 from side's side clearance.Between an end face of the other end of fixed part 121 and driving shaft, be provided with the gap, make them when piezoelectric element 4 maximum extensions, also not contact.Any one of the end 2c of holding section 2a when the other end 122a of fitting portion 122 moves to an other side end than the other end 2b of the holding section 2a of friction apply when the holding section of driving shaft 6 2a moves to a side end and holding section 2a all more is positioned at the opposing party's side.Need to prove that as shown in Figure 9, in the outside of fitting portion 122,3 breach faces that extended by the bearing of trend to datum line FL are formed with notch part 122b, make driving shaft 6 be supported by fitting portion 122 at 3 places.
As the drive unit 10 of above formation in, the fixed part 121 that is located at the support unit 120 among the dead eye 11a of isolation part 11 is fixed on the support 3, the fitting portion 122 of support unit 120 is entrenched among the hollow bulb 6a of driving shaft 6.Thus, for example with only compare with the situation of dead eye supporting driving shaft 6, can the long support zone that is provided with by 122 pairs of driving shafts 6 of fitting portion.Thereby, can prevent that piezoelectric element 4 is supported by support 3 under the state that driving shaft 6 is toppled over respect to datum line FL.Thus, for example in band camera phones or small digital cameras etc., during driving lens etc., can obtain high optical property.
Further, owing to prevent driving shaft 6 with respect to the toppling over of datum line FL, therefore, axle 9 only is set as the spline axle of lens-mount 2 by support unit 120, can be with the leading axle of driving shaft 6 as lens-mount 2.Thus, even the leading axle of lens-mount 2 is not set separately, for example in band camera phones or small digital cameras etc., during driving lens etc., also can prevent the deterioration of optical property outside driving shaft 6.
Among the end 2c of holding section 2a when in addition, the other end 122a of fitting portion 122 moves to the opposite side end than the other end 2b of the holding section 2a of friction apply when the holding section of driving shaft 6 2a moves to a side end and holding section 2a any one all more is positioned at the opposing party's side.Thus, fitting portion 122 becomes the core of the driving shaft 6 in the hollow bulb, prevents driving shaft 6 fractures in the time of can being subjected to impacting being waited by landing.Its reason be because, if driving shaft 6 is waited by landing and is impacted, the end 2c of holding section 2a when then existing the other end 2b of the holding section 2a when holding section 2a moves to a side end or holding section 2a and moving to the opposite side end, stress concentrate on driving shaft 6 and make the misgivings of driving shaft 6 fractures.
In addition,, be formed with notch part 122b, make driving shaft 6 be supported by fitting portion 122 at 3 places by 3 breach faces that on the bearing of trend of datum line FL, extend at the outer surface of fitting portion 122.At this moment, because the contact area of the inner surface of the hollow bulb 6a of the outer surface of fitting portion 122 and driving shaft 6 diminishes, therefore, driving shaft 6 is come and gone sleekly with respect to fitting portion 122 move.And, being supported by fitting portion 122 at 3 places by driving shaft 6, therefore driving shaft 6 relative fitting portions 122 and being positioned, can prevent driving shaft 6 toppling over respect to datum line FL reliably.
Yet, when making drive unit 10, also can be used to make piezoelectric element 4 be bearing on the support 3 (promptly, be used for keeping the silicone cap sleeve 5 of piezoelectric element 4 to be bonded on the support 3) before the silicone adhesive sclerosis, make of the fixed position variation of the fixed part 121 of support unit 120, adjust the inclination of driving shaft 6 with respect to datum line FL with respect to an end face of support 3.According to the manufacture method of above-mentioned drive unit 10, can prevent under the state of toppling over of driving shaft 6 with respect to datum line FL piezoelectric element 4 to be bearing on the support 3.And, the manufacture method of above-mentioned drive unit 10, even be not elastic binder as silicone adhesive, and also effective when becoming the binding agent of high rigidity when being to use sclerosis.
In the 3rd execution mode, shown in Fig. 1 C and Fig. 2 C, be provided with the limiting part 220 of restriction driving shaft 6 in the open side of bearing ditch 211a, 212a, and be installed on the support 3 with respect to the inclination of datum line FL.Limiting part 220 have the fixed part 221 that is fixed on the support 3 and with driving shaft 6 by the press section 222 on the inner surface that is pressed in bearing ditch 211a, 212a.222 pairs of driving shaft 6 application of forces in press section are to the inner surface of bearing ditch 211a, 212a, so that masterpiece is used in and datum line FL roughly on the direction of quadrature.As shown in figure 13, driving shaft 6 is formed 2 the inner surface 211b of section V word shape and the inner surface 222a of press section 222 and supports at 3 places in bearing ditch 211a.Above-mentioned be formed among the bearing ditch 212a also identical.Need to prove, with respect to the pressing force of the driving shaft 6 of bearing ditch 211a, 212a inner surface for not hindering along the size that comes and goes the degree that moves of the driving shaft 6 of datum line FL.
As the drive unit 100 of above formation in, by being located at the limiting part 220 on bearing ditch 211a, the 212a that support 3 had, restriction driving shaft 6 is with respect to the inclination of datum line FL.More specifically, driving shaft 6 is pushed press section 222 supportings of face within it at 3 places by 2 inner surfaces of each bearing ditch 211a, 212a and with driving shaft 6, and thus, driving shaft 6 is positioned.Thereby, can prevent from reliably to be supported by support 3 with respect to the state lower piezoelectric element 4 that datum line FL topples at driving shaft 6.Thus, for example in band camera phones or small digital cameras etc., during driving lens etc., can obtain high optical property.
Further since by limiting part 220 restriction driving shafts 6 with respect to the toppling over of datum line FL, therefore, the axle 9 spline axles as lens-mount 2 only are set, driving shaft 6 can be made as the leading axle of lens-mount 2.Thus, even the leading axle of lens-mount 2 is not set separately, also can be for example in band camera phones or small digital cameras etc., during driving lens etc., prevent the deterioration of optical property outside driving shaft 6.
In addition, limiting part 220 is installed in the open side of bearing ditch 211a, 212a.Thus, driving shaft 6 after its open side is configured in bearing ditch 211a, 212a, can be installed in limiting part 220 open side of bearing ditch 211a, 212a.Thereby, can improve the assembleability of drive unit 100.
At this, the action of drive unit 1,10,100 is described.Fig. 4 is the circuit diagram that makes the drive circuit of the piezoelectric element running shown in Figure 1A, Figure 1B and Fig. 1 C.Fig. 5 is the oscillogram that inputs to the input signal of drive circuit shown in Figure 4, and Fig. 6 is the oscillogram from the output signal of drive circuit output shown in Figure 4.
As shown in Figure 4, drive circuit 31 is located in the control part 30.Control part 30 is the parts that carry out the integral body control of drive unit 1, for example has CPU, ROM, RAM, input signal circuit and output signal circuit etc.Drive circuit 31 has the function as the drive circuit of piezoelectric element 4, and 4 outputs drive and use the signal of telecommunication for piezoelectric element.Drive circuit 31 is from the control signal generating unit input control signal of control part 30, and its control signal carried out voltage amplification or electric current amplifies and the driving signal of telecommunication of output piezoelectric element 4.Drive circuit 31 for example uses and constitutes the input section by logical circuit U1～U3, and possesses the circuit of FET (FET) Q1, Q2 at deferent segment.Transistor Q1, Q2, as output signal, exportable Hi output (high potential output), Lo output (electronegative potential output) and OFF output (open output).
Fig. 5 (a) is the input signal of input when lens-mount 2 is moved, so that holding section 2a approaches piezoelectric element 4, Fig. 5 (b) is the input signal of input when lens-mount 2 is moved, so that holding section 2a leaves from piezoelectric element 4.In addition, Fig. 6 (a) is the output signal of output when lens-mount 2 is moved, so that holding section 2a approaches piezoelectric element 4, Fig. 6 (b) is the output signal of output when lens-mount 2 is moved, so that holding section 2a leaves from piezoelectric element 4.
The output signal of Fig. 6 (a), Fig. 6 (b) be with the pulse signal of the identical time ON/OFF of input signal of Fig. 5 (a), Fig. 5 (b).2 signals of Fig. 6 (a), Fig. 6 (b) are input to input terminal 4a, the 4b of piezoelectric element 4.Though also can have the pulse signal of zigzag waveform in this input terminal 4a, 4b input, as shown in Figure 6,, also can make piezoelectric element 4 actions even input has the pulse signal of rectangular-shaped waveform.At this moment, because the drive signal of piezoelectric element 4 also can be the pulse signal with rectangular-shaped waveform, therefore, signal generates and becomes easy.
The output signal of Fig. 6 (a), Fig. 6 (b) is by constituting for 2 pulse signals of same frequency.These 2 pulse signals, by making phase place difference each other, the potential difference that the potential difference that becomes signal each other becomes the signal that diminishes greatly and sharply interimly or becomes signal each other sharply becomes the signal that diminishes greatlyly and interimly.By importing above-mentioned 2 signals, can make the elongation speed of piezoelectric element 4 different with contraction speed, can make holding section 2a and then lens-mount 2 is moved.
For example, in Fig. 6 (a), Fig. 6 (b), after the signal that is set to a side became Lo (low) from Hi (height), the opposing party's signal became Hi.In those signals, be set to when a side signal becomes Lo, through certain time lag t
OFFAfter, the opposing party's signal becomes Hi.In addition, when 2 signal both sides are all Lo, be made as closed condition (open state) as output.
As the output signal of Fig. 6 (a), Fig. 6 (b), that is, make the signal of telecommunication of piezoelectric element 4 actions, use the frequency signal that surpasses audio frequency.In Fig. 6 (a), Fig. 6 (b), the frequency of 2 signals is set as the frequency signal above audio frequency, for example is set as 30～80kHz, the more preferably frequency signal of 40～60kHz.By using the said frequencies signal, can reduce the action sound in listened to the field of piezoelectric element 4.
According to more than, drive unit 1,10,100 following actions.That is, the signal of telecommunication is input to piezoelectric element 4, by the input of this signal of telecommunication, and piezoelectric element 4 cyclic extensions and contraction.According to this elongation and contraction, driving shaft 6 comes and goes and moves.At this moment, different by the elongation speed that makes piezoelectric element 4 with contraction speed, the speed that driving shaft 6 moves to a direction and dissimilate to the speed that other direction moves.Thus, can make holding section 2a and then lens-mount 2 is moved to desired direction.
Fig. 7 is the part sectioned view of another execution mode of expression first drive unit of the present invention.As shown in Figure 7, in drive unit 1, tilt adjusting mechanism 20 has: columnar portion 21, and it is the fitting portion 11b that center line is formed on the inner surface 11c on the isolation part 11 from side's side interference fit in having with datum line FL; And cylindrical portion 23, it is matched with the dead eye 11a of isolation part 11 from side's side clearance, and cooperates an end of driving shaft 6 from the opposing party's side clearance.Be provided with the gap between one end face of the other end of columnar portion 21 and driving shaft 6, make them when piezoelectric element 4 maximum extensions, also not contact.Need to prove, as shown in Figure 8, the centre line C L 1 of columnar portion 21 and the centre line C L 2 of cylindrical portion 23, an off-centre is 1/100mm for example.
As in the drive unit 1 of above formation, in tilt adjusting mechanism 20, centre line C L 2 off-centre of the centre line C L 1 of columnar portion 21 and cylindrical portion 23.Therefore, be that center line is formed on columnar portion chimeric on the fitting portion 11b of the inner surface 11c on the isolation part 11 21 rotation by making having with datum line FL, can be easily and adjust the inclination of driving shaft 6 reliably with respect to datum line FL.
The present invention is not limited to above-mentioned execution mode.
In the first embodiment, for example, under the situation that piezoelectric element 4 is supported by support 3 from the side of the bearing of trend of relative datum line FL, also can be at the unfixing hammer parts 8 of the other end of piezoelectric element 4.And, by support 3 supporting piezoelectric elements 4, be not limited to from the side supporting of the bearing of trend of relative datum line FL, also can be on support 3 the fixing other end of piezoelectric element 4, the opposing party's side from the bearing of trend of relative datum line FL supports.
In addition, at first execution mode, driving shaft 6 is cylindric, but is not limited to this.As an example, be formed with hollow bulb 6a in an end of driving shaft 6, as the recess of section circle, the columnar portion 22 of tilt adjusting mechanism 20 also can with the hollow bulb 6a matched in clearance that forms as recess.
In addition, in second execution mode, driving shaft 6 is supported by fitting portion 122 at 3 places and be positioned at least, therefore, the notch part 122b that extends on the bearing of trend of datum line FL also can be formed on the outside of fitting portion 122, makes driving shaft 6 be supported by fitting portion 122 at 4 places.
In addition, as shown in figure 10, also can be formed on the notch part 6b that extends on the bearing of trend of datum line FL at the inner surface of the hollow bulb 6a of driving shaft 6, make driving shaft 6 at least 3 places (, being 6 places) at this supported by fitting portion 122.At this moment, because the contact area of the inner surface of the outer surface of fitting portion 122 and the hollow bulb 6a of driving shaft 6 diminishes, driving shaft 6 is come and gone sleekly with respect to fitting portion 122 to be moved, simultaneously, because driving shaft 6 relative fitting portions 122 are positioned, therefore, can prevent driving shaft 6 toppling over reliably with respect to datum line FL.
Need to prove, be formed on fitting portion 122 outer surface notch part 122b or be formed on the notch part 6b of inner surface of the hollow bulb 6a of driving shaft 6, also can be the parts of ditch shape etc.As shown in figure 11, the also ditch shape notch part 122b that can extend on by the bearing of trend that is formed on datum line FL at the outer surface of fitting portion 122, be formed on the projecting strip part 122c that extends on the bearing of trend of datum line FL, make driving shaft 6 be supported by fitting portion 122 at 3 places at least.Perhaps, as shown in figure 12, also can be at the inner surface of the hollow bulb 6a of driving shaft 6, by the notch part 6b of the ditch shape that extends on the bearing of trend that is formed on datum line FL, be formed on the projecting strip part 6c that extends on the bearing of trend of datum line FL, make driving shaft 6 be supported by fitting portion 122 at 3 places at least.In these cases, at least 3 projecting strip part 122c by contacting with the inner surface of the hollow bulb 6a of driving shaft 6.Or at least 3 projecting strip part 6c that contact with the outer surface of fitting portion 122, the contact area of the inner surface of the hollow bulb 6a of the outer surface of fitting portion 122 and driving shaft 6 diminishes, therefore, driving shaft 6 is come and gone sleekly with respect to fitting portion 122 to be moved, simultaneously, driving shaft 6 is positioned with respect to fitting portion 122, therefore, can prevent driving shaft 6 toppling over respect to datum line FL reliably.
On the other hand, may not form notch part at the inner surface of the hollow bulb 6a of the outer surface of fitting portion 122 or driving shaft 6.At this moment, as long as inner surface at the hollow bulb 6a of the outer surface of fitting portion 122 or driving shaft 6, carry out the surface treatment that chemical grinding, electrolytic polishing, lubricated plating etc. can reduce coefficient of friction, driving shaft 6 is moved with respect to coming and going of fitting portion 122 become smooth and easy.
In addition, at piezoelectric element 4 from the side of the bearing of trend of relative datum line FL during by support 3 supportings, also can be at the fixing hammer of the other end parts 8 of piezoelectric element 4.And, by support 3 supporting piezoelectric elements 4, be not limited to support from side with respect to the bearing of trend of datum line FL, also can be at the fixing other end of piezoelectric element 4 of support 3 grades, the opposing party's side from the bearing of trend of relative datum line FL supports.
In addition, in second execution mode,, be not limited to this though driving shaft 6 is cylindric.As an example, also can be formed with hollow bulb 6a, the fitting portion 122 of support unit 120 and the hollow bulb 6a matched in clearance that forms as recess as the recess of section circle in an end of driving shaft 6.
In addition, in the 3rd execution mode, as shown in figure 14, driving shaft 6 also can be formed the inner surface 211b of section U word shape and form section V word shape in press section 222 in bearing ditch 211a at 3 places 2 inner surface 222a supportings.Above-mentioned be formed among the bearing ditch 212a also identical.Need to prove that therefore driving shaft 6, is supported and also can as long as be supported and can locate at 3 places at least more than 4 places.
In addition, press section 222, as shown in figure 15, can be for being screwed on the screw on the fixed part 221, perhaps, and as shown in figure 16, also can be for be installed in the spring on the fixed part 221 with compressed state.When press section 222 is screw, tighten situation, can adjust the pressing force of driving shaft 6 with respect to the inner surface of bearing ditch 211a, 212a according to it.In addition, when press section 222 is spring,, can adjust the pressing force of driving shaft 6 with respect to the inner surface of bearing ditch 211a, 212a by changing its spring constant.
In addition, press section 222 is not limited to driving shaft 6 by the inner surface that is pressed in bearing ditch 211a, 212a, also can be the parts of the gap smaller between the inner surface of the outer surface that makes driving shaft 6 and bearing ditch 211a, 212a.At this moment, by of the inclination of limiting part 220 restriction driving shafts 6, therefore, can prevent driving shaft 6 toppling over respect to datum line FL with respect to datum line FL.
In addition, at piezoelectric element 4 from the side of the bearing of trend of relative datum line FL during by support 3 supportings, also can be at the fixing hammer of the other end parts 8 of piezoelectric element 4.And, by support 3 supporting piezoelectric elements 4, be not limited to from the side supporting of the bearing of trend of relative datum line FL, also can be on support 3 the fixing other end of piezoelectric element 4, the opposing party's side from the bearing of trend of datum line FL supports.
Claims (14)
1. drive unit is characterized in that possessing:
Dynamo-electric conversion element, it is flexible on the bearing of trend of the datum line of regulation;
Driving shaft, it is installed in an end of the above-mentioned dynamo-electric conversion element on the above-mentioned bearing of trend;
Driven member, its friction apply is on above-mentioned driving shaft;
Support, it supports above-mentioned dynamo-electric conversion element, and has the bearing portion of above-mentioned driving shaft;
Tilt adjusting mechanism, it is located at above-mentioned bearing portion and adjusts the inclination of above-mentioned driving shaft with respect to the said reference line.
2. drive unit according to claim 1 is characterized in that,
Above-mentioned dynamo-electric conversion element is supported by above-mentioned rack elasticity.
3. drive unit according to claim 1 and 2 is characterized in that,
Above-mentioned tilt adjusting mechanism has: first columnar portion, and it is entrenched in, and to have with above-mentioned datum line be the fitting portion that center line is formed on the inner surface on the above-mentioned support; And second columnar portion, it is entrenched in the hollow bulb that is formed at least one end of above-mentioned driving shaft,
The second center line off-centre of first center line of above-mentioned first columnar portion and above-mentioned second columnar portion.
4. drive unit according to claim 1 and 2 is characterized in that,
Above-mentioned tilt adjusting mechanism has: columnar portion, and it is entrenched in, and to have with above-mentioned datum line be the fitting portion that center line is formed on the inner surface on the above-mentioned support; And cylindrical portion, an end of its chimeric above-mentioned driving shaft,
The second center line off-centre of first center line of above-mentioned columnar portion and above-mentioned cylindrical portion.
5. the manufacture method of a drive unit, described drive unit possesses: dynamo-electric conversion element, it is flexible on the bearing of trend of the datum line of regulation; Driving shaft, it is installed in an end of the above-mentioned dynamo-electric conversion element on the above-mentioned bearing of trend; Driven member, its friction apply is on above-mentioned driving shaft; Support, it supports above-mentioned dynamo-electric conversion element, and the manufacture method of described drive unit is characterised in that,
Be included in and be used to make above-mentioned dynamo-electric conversion element to be bearing in before the binding agent sclerosis on the above-mentioned support, adjust the operation of above-mentioned driving shaft with respect to the inclination of said reference line.
6. drive unit is characterized in that possessing:
Dynamo-electric conversion element, it is flexible on the bearing of trend of the datum line of regulation;
Driving shaft, it is installed in an end of the above-mentioned dynamo-electric conversion element on the above-mentioned bearing of trend;
Driven member, its friction apply is on above-mentioned driving shaft;
Support, it supports above-mentioned dynamo-electric conversion element, and has the bearing portion of above-mentioned driving shaft;
Support unit, it is located at above-mentioned bearing portion, and has the fitting portion on the hollow bulb that is fixed on the fixed part on the above-mentioned support and is entrenched at least one end that is formed at above-mentioned driving shaft.
7. drive unit according to claim 6 is characterized in that,
The other end of above-mentioned fitting portion, the either party of one end of the above-mentioned holding section the when other end of the above-mentioned holding section when moving to a side end with friction apply in the holding section of the above-mentioned driven member of above-mentioned driving shaft and above-mentioned holding section move to the opposite side end compares, and more is positioned at the opposing party's side.
8. according to claim 6 or 7 described drive units, it is characterized in that,
Outer surface at above-mentioned fitting portion is formed with the notch part that extends on above-mentioned bearing of trend, make above-mentioned driving shaft be supported by above-mentioned fitting portion at least 3 places.
9. according to claim 6 or 7 described drive units, it is characterized in that,
Inner surface at the above-mentioned hollow bulb of above-mentioned driving shaft is formed with the notch part that extends on above-mentioned bearing of trend, make above-mentioned driving shaft be supported by above-mentioned fitting portion at least 3 places.
10. drive unit is characterized in that possessing:
Dynamo-electric conversion element, it is flexible on the bearing of trend of the datum line of regulation;
Driving shaft, it is installed in an end of the above-mentioned dynamo-electric conversion element on the above-mentioned bearing of trend;
Driven member, its friction apply is on above-mentioned driving shaft;
Support, it supports above-mentioned dynamo-electric conversion element, and has the bearing portion of above-mentioned driving shaft;
Limiting part, it is located at above-mentioned bearing portion and limits the inclination of above-mentioned driving shaft with respect to the said reference line.
11. drive unit according to claim 10 is characterized in that,
Above-mentioned limiting part is installed in the open side of the above-mentioned bearing portion that is formed on above-mentioned support as ditch.
12. according to claim 10 or 11 described drive units, it is characterized in that,
Above-mentioned limiting part has the fixed part that is fixed on the above-mentioned support and with the press section of above-mentioned driving shaft by the inner surface that is pressed in above-mentioned bearing portion,
Above-mentioned driving shaft in above-mentioned bearing portion at least 3 places by the inner surface and the supporting of above-mentioned press section of above-mentioned bearing portion.
13. drive unit according to claim 12 is characterized in that,
Above-mentioned press section is the screw that is screwed on said fixing portion.
14. drive unit according to claim 12 is characterized in that,
Above-mentioned press section is mounted in the spring of said fixing portion.
Applications Claiming Priority (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007186135A JP2009025403A (en) | 2007-07-17 | 2007-07-17 | Drive device and method of manufacturing the same |
| JP2007-186135 | 2007-07-17 | ||
| JP2007186150 | 2007-07-17 | ||
| JP2007186140A JP4994137B2 (en) | 2007-07-17 | 2007-07-17 | Drive device |
| JP2007186135 | 2007-07-17 | ||
| JP2007186140 | 2007-07-17 | ||
| JP2007-186150 | 2007-07-17 | ||
| JP2007-186140 | 2007-07-17 | ||
| JP2007186150A JP2009025407A (en) | 2007-07-17 | 2007-07-17 | Drive device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101131069A Division CN102176645A (en) | 2007-07-17 | 2008-06-26 | Driving apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101350572A true CN101350572A (en) | 2009-01-21 |
| CN101350572B CN101350572B (en) | 2011-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101102859A Expired - Fee Related CN101350572B (en) | 2007-07-17 | 2008-06-26 | Driving apparatus, and manufacturing method of the same |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2009025403A (en) |
| CN (1) | CN101350572B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102077456A (en) * | 2009-02-27 | 2011-05-25 | 日立麦克赛尔株式会社 | Drive device, lens part, and camera module |
| CN104238066A (en) * | 2013-09-10 | 2014-12-24 | 惠州市大亚湾永昶电子工业有限公司 | Actuator unit |
| CN106959497A (en) * | 2017-05-25 | 2017-07-18 | 中山联合光电科技股份有限公司 | A kind of lens construction focused using six axles |
| CN107315232A (en) * | 2016-04-26 | 2017-11-03 | 新思考电机有限公司 | Lens driver, the cam device and electronic equipment for being configured with lens driver |
| CN108231994A (en) * | 2016-12-21 | 2018-06-29 | Tdk株式会社 | Piezoelectric unit |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010047182A1 (en) * | 2008-10-22 | 2010-04-29 | コニカミノルタオプト株式会社 | Drive device and imaging device |
| JP5446740B2 (en) * | 2009-11-04 | 2014-03-19 | コニカミノルタ株式会社 | Imaging device |
| EP2498112A4 (en) * | 2009-11-04 | 2013-05-15 | Konica Minolta Advanced Layers | Image pickup device, method for manufacturing image pickup device, and jig for adjusting image pickup device |
| JPWO2012147320A1 (en) * | 2011-04-28 | 2014-07-28 | コニカミノルタ株式会社 | Imaging apparatus and manufacturing method of imaging apparatus |
-
2007
- 2007-07-17 JP JP2007186135A patent/JP2009025403A/en active Pending
-
2008
- 2008-06-26 CN CN2008101102859A patent/CN101350572B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102077456A (en) * | 2009-02-27 | 2011-05-25 | 日立麦克赛尔株式会社 | Drive device, lens part, and camera module |
| CN102077456B (en) * | 2009-02-27 | 2015-06-24 | 日立麦克赛尔株式会社 | Drive device, lens part, and camera module |
| CN104238066A (en) * | 2013-09-10 | 2014-12-24 | 惠州市大亚湾永昶电子工业有限公司 | Actuator unit |
| CN107315232A (en) * | 2016-04-26 | 2017-11-03 | 新思考电机有限公司 | Lens driver, the cam device and electronic equipment for being configured with lens driver |
| CN107315232B (en) * | 2016-04-26 | 2023-10-31 | 新思考电机有限公司 | Lens driving device, camera device equipped with lens driving device, and electronic apparatus |
| CN108231994A (en) * | 2016-12-21 | 2018-06-29 | Tdk株式会社 | Piezoelectric unit |
| CN108231994B (en) * | 2016-12-21 | 2021-07-06 | Tdk株式会社 | Piezoelectric unit |
| CN106959497A (en) * | 2017-05-25 | 2017-07-18 | 中山联合光电科技股份有限公司 | A kind of lens construction focused using six axles |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101350572B (en) | 2011-07-06 |
| JP2009025403A (en) | 2009-02-05 |
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