CN1980036B - Driving control device, portable optical apparatus and driving control method - Google Patents

Driving control device, portable optical apparatus and driving control method Download PDF

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Publication number
CN1980036B
CN1980036B CN2006101493196A CN200610149319A CN1980036B CN 1980036 B CN1980036 B CN 1980036B CN 2006101493196 A CN2006101493196 A CN 2006101493196A CN 200610149319 A CN200610149319 A CN 200610149319A CN 1980036 B CN1980036 B CN 1980036B
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China
Prior art keywords
driving
estimate
evaluation
drive pulses
driving pulse
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CN2006101493196A
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CN1980036A (en
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秋叶真
吉田秀夫
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Fujinon Corp
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Fujinon Corp
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Priority claimed from JP2005336174A external-priority patent/JP2007140292A/en
Priority claimed from JP2005336229A external-priority patent/JP4668041B2/en
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Abstract

A driving control device (20) controls supply of driving pulses according to a manner that an expansion rate and a constriction rate of a piezoelectric element (12) along a predetermined direction are different, to expand and contract the piezoelectric element (12) to vibrate a driving rod (17) and move a lens (21) frictionally engaging with the driving rod (17) in two directions along the predetermined direction. The driving control device includes an actual driving pulse number measuring unit (32) that measures actual driving pulse numbers, which are required to move the lens (21) by a predetermined movement amount in the two directions, before a focusing operation of the lens (21); a correction factor calculating unit (33) that calculates correction factors relating to a driving pulse number, based on the actual driving pulse numbers and a predetermined reference pulse number in the two directions; and a driving pulse number correcting unit (34) that corrects a driving pulse number supplied to the piezoelectric element (12) based on the correction factors in the two directions. In this way, with a low cost CPU construct, driving control with a predetermined level can be achieved from a starting stage during control.

Description

Driving control device, portable optical apparatus and drive controlling method
Technical field
Driving control device, portable optical apparatus and the drive controlling method of electricapparatus conversion element have been the present invention relates to use.
Background technology
In the past, for the actuator that has adopted piezoelectric element various schemes had been proposed.For example, proposed to use the focusing of the lens of camera to drive the executive component (with reference to JapanesePatent No.2633066 (corresponding to U.S.Patent No.5,225,941)) of the piezoelectric element of usefulness.In this executive component, generally be by according to making along the extension speed mode different of the piezoelectric element of prescribed direction with contraction speed, the driving pulse that control provides to this piezoelectric element, make this piezoelectric element flexible, thus, the shaft component that makes lens drive usefulness vibrates along the afore mentioned rules direction, thereby makes with the lens of this shaft component friction apply mobile minutely along the afore mentioned rules direction.
; in above-mentioned executive component; because by making this piezoelectric element flexible according to making along the extension speed mode different of the piezoelectric element of prescribed direction with contraction speed; therefore shaft component is vibrated along the afore mentioned rules direction; thereby make small the moving of lens generation with this shaft component friction apply; so, be difficult to make lens only to move and the proportional distance of number of drive pulses.
In view of this problem points, at JP Hei.11-356070 A (corresponding to U.S.PatentNo.6,249, a kind of following technology is disclosed 093), the i.e. precision that drives for the focusing that improves lens, obtain the translational speed of these lens by the amount of movement that detects lens, control the supply stand-by time that lens drive the driving pulse of usefulness, so that the translational speed of these lens becomes predefined target velocity.In this technology, because carrying out the focusing of lens on one side drives, at every moment ask for the translational speed of lens on one side, carry out High-speed Control based on multimode, so that the translational speed of these lens becomes predetermined target velocity, so,, can expect high-precision focusing drive controlling except the starting stage of this control.
But, in JP Hei.11-356070A, owing to the High-speed Control that need carry out based on multimode, so, need possess the control device that has carried multitask CPU, therefore, in the control device that has only carried cheap single task CPU, can't realize.And, because the supply stand-by time of controlling and driving pulse in the supply stand-by time of controlling and driving pulse so focus on the starting stage that drives at this, can't be expected high-precision focusing drive controlling.
Summary of the invention
The present invention proposes in order to solve above-mentioned problem, and its purpose is, provides a kind of by cheap CPU structure, begins just can to realize the driving control device and the drive controlling method of the drive controlling of the above precision of regulation grade from starting stage of control.
According to a certain side of the present invention, driving control device, possess: along the flexible electricapparatus conversion element of prescribed direction, be fixed on the drive member of an end of the electricapparatus conversion element of prescribed direction, with the driving pulse control part that the driving pulse of supplying with towards the electricapparatus conversion element is controlled, the driving pulse control part is according to making along the extension speed mode different with contraction speed of the electricapparatus conversion element of prescribed direction, the supply of controlling and driving pulse and make the electricapparatus conversion element flexible, drive member is vibrated along prescribed direction, thus make with this drive member friction apply be driven member to comprise along a direction of prescribed direction with and the twocouese of contrary direction move.The driving pulse control part comprises: actual number of drive pulses is measured mechanism, and it was measured actual making respectively at twocouese and be driven member and move the needed actual number of drive pulses of regulation amount of movement before the location action that is driven the member location begins; Correction coefficient is calculated mechanism, and it is at twocouese, respectively based on actual number of drive pulses that is obtained by mensuration and predetermined basic pulse number, calculates and is used for number of drive pulses and is driven the correction coefficient that the relation between the displacement of member is proofreaied and correct; With the number of drive pulses aligning gear, it is based on the twocouese of calculating correction coefficient separately, to be driven that member moves and to proofread and correct to the element drives umber of pulse that the electricapparatus conversion element is supplied with in order to make.
In addition, drive controlling method involved in the present invention, possessing: along the flexible electricapparatus conversion element of prescribed direction, be fixed on the drive member of an end of the electricapparatus conversion element of prescribed direction, with the controlling and driving pulse in the driving control device of the driving pulse control part of the supply of electricapparatus conversion element, utilize the driving pulse control part, according to making along the extension speed mode different of the electricapparatus conversion element of prescribed direction with contraction speed, the supply of controlling and driving pulse and make the electricapparatus conversion element flexible, drive member is vibrated along prescribed direction, thereby make with this drive member friction apply be driven member to comprise along a direction of prescribed direction with and the twocouese of contrary direction move, described drive controlling method comprises: actual number of drive pulses determination step, wherein before the location action that is driven member location begins, the driving pulse control part makes each mensuration of twocouese and is driven the needed actual number of drive pulses of the actual mobile regulation amount of movement of member; Correction coefficient is calculated step, wherein the driving pulse control part, is calculated and is used for number of drive pulses and is driven the correction coefficient that the relation between the displacement of member is proofreaied and correct respectively based on actual number of drive pulses that is obtained by mensuration and predetermined basic pulse number at twocouese; With the number of drive pulses aligning step, the driving pulse control part to be driven member and to move in order to make based on the twocouese of calculating correction coefficient separately, and the element drives umber of pulse that subtend electricapparatus conversion element is supplied with is proofreaied and correct.
In addition, above-mentioned " regulation amount of movement " mainly is meant the distance of regulation, but also can be the number of drive pulses of regulation.
Driving control device and the drive controlling method related according to the invention described above, before the location action that is driven the member location begins, the driving pulse control part is measured respectively at above-mentioned twocouese and is made the needed actual number of drive pulses of the actual mobile regulation amount of movement of detected member, and based at twocouese and each freely measures actual number of drive pulses and the predetermined basic pulse number that obtains, calculate and be used for number of drive pulses and be driven the correction coefficient that the relation between the displacement of member is proofreaied and correct.Then, the driving pulse control part to be driven member and to move in order to make based on the twocouese of calculating correction coefficient separately, and the element drives umber of pulse of supplying with towards the electricapparatus conversion element is proofreaied and correct.
Like this, in the present invention, owing to be not when positioning action, but before location action begins, to being driven that member moves and proofreading and correct to the element drives umber of pulse that the electricapparatus conversion element is supplied with in order to make, so, while do not need can constitute by the CPU of cheapness and realize as positioning the CPU that action at every moment has the multitask ability the prior art of control element number of drive pulses.And, owing to before location action begins, finished the correction of element drives umber of pulse, so, just can realize stipulating the drive controlling of the precision more than the grade from the starting stage of location action.
In addition, in driving control device involved in the present invention, the driving pulse control part also comprises the correction decision mechanism, it is based on asking for to separately actual number of drive pulses and predetermined basic pulse number by both party, the relevant predetermined coefficients that deviates from actual number of drive pulses and basic pulse number, and specified reference value, judge whether the correction of number of drive pulses that need be corresponding with temperature variation, under the situation of the correction of number of drive pulses that need be corresponding with temperature variation, the number of drive pulses aligning gear is implemented the correction corresponding with predetermined temperature variation to the element drives umber of pulse.
And, drive controlling method involved in the present invention, be preferably, also comprise the correction determining step, wherein the driving pulse control part is based on asking for to separately actual number of drive pulses and predetermined basic pulse number by both party, the relevant predetermined coefficients that deviates from actual number of drive pulses and basic pulse number, and specified reference value, judge whether the correction of number of drive pulses that need be corresponding with temperature variation, under the situation of the correction that is judged as number of drive pulses that need be corresponding with temperature variation, the driving pulse control part is implemented the correction corresponding with predetermined temperature variation to the element drives umber of pulse.
Like this, by judging whether the correction of number of drive pulses that need be corresponding with temperature variation, under the situation of the correction that is judged as umber of pulse that need be corresponding with temperature variation, the element drives umber of pulse is implemented the correction corresponding with predetermined temperature variation, can realize more high-precision drive controlling.
In addition, the above-mentioned member that is driven comprises lens and constitutes, and prescribed direction can be set at the optical axis direction of lens.That is, driving control device involved in the present invention and drive controlling method can be applicable to along the drive controlling of the lens of the lens position of optical axis direction.
According to the present invention, can be by the CPU formation of cheapness from the starting stage of control, the drive controlling of the above precision of realization regulation grade.
Other the side according to the present invention, driving control device possesses: along the flexible electricapparatus conversion element of prescribed direction, be fixed on the drive member of an end of the electricapparatus conversion element of prescribed direction, with to driving pulse control part towards the supply of the driving pulse of electricapparatus conversion element, the driving pulse control part is according to making along the extension speed mode different with contraction speed of the electricapparatus conversion element of prescribed direction, the supply of controlling and driving pulse, make the electricapparatus conversion element flexible, thus, make the drive member vibration along prescribed direction, thereby make and comprise the member that is driven that constitutes with the lens of this drive member friction apply and move along prescribed direction, the driving pulse control part comprises: along direction detection mechanism, it on one side makes this be driven member this driving direction that is driven member in the focusing action of lens by each regulation number of drive pulses and moves, on one side in each AF evaluation of estimate of measuring the regulation that the image taken by these lens obtains when mobile; The inverse move control gear, it makes to be driven the mode that member returns to contrary direction, the supply of controlling and driving pulse according to towards the direction that has obtained utilizing along the peaked position of the AF evaluation of estimate of direction detection mechanism gained; Contrary direction detection mechanism, it returns the position that stops and measuring the AF evaluation of estimate utilizing the inverse move control gear, and, by each regulation number of drive pulses from this position make and be driven member to contrary direction move stipulated number on one side, on one side in each AF evaluation of estimate of measuring when mobile; Determine mechanism with moving direction, it is according to the maximal value of the AF evaluation of estimate that is obtained by suitable direction detection mechanism and each the AF evaluation of estimate that is obtained by contrary direction detection mechanism, condition according to the rules, the moving direction that is driven member during with the mensuration of carrying out the AF evaluation of estimate once more, be defined as wherein a kind of in driving direction or the contrary direction, based on the moving direction that is determined, suitable direction detection mechanism or contrary direction detection mechanism measure once more from moving the position that is driven member based on contrary direction detection mechanism.
And, drive controlling method involved in the present invention, possessing: along the flexible electricapparatus conversion element of prescribed direction, be fixed on the drive member of an end of the electricapparatus conversion element of prescribed direction, with control in the driving control device of the driving pulse control part of the supply of the driving pulse of electricapparatus conversion element, by utilizing the driving pulse control part, according to making along the extension speed mode different of the electricapparatus conversion element of prescribed direction with contraction speed, the supply of controlling and driving pulse, make the electricapparatus conversion element flexible, thus, make the drive member vibration along prescribed direction, thereby make and comprise the member that is driven that constitutes with the lens of this drive member friction apply and move along prescribed direction, described drive controlling method comprises: along the direction detection step, the driving pulse control part on one side makes this be driven member this driving direction that is driven member in the focusing action of lens by each regulation number of drive pulses and moves, on one side in each AF evaluation of estimate of measuring the regulation that the image taken by these lens obtains when mobile; The inverse move controlled step, wherein the driving pulse control part makes to be driven the mode that member returns to contrary direction, the supply of controlling and driving pulse according to towards along the direction that has obtained the peaked position of AF evaluation of estimate in the direction detection step; Contrary direction detection step, the driving pulse control part returns the position that stops and measuring the AF evaluation of estimate in the inverse move controlled step, and, by each regulation number of drive pulses from this position make and be driven member to contrary direction move stipulated number on one side, on one side in each AF evaluation of estimate of measuring when mobile; The moving direction determining step, wherein the driving pulse control part is according to each of the AF evaluation of estimate that obtains by the maximal value of the AF evaluation of estimate that obtains along the direction detection step with by contrary direction detection step, condition according to the rules, the moving direction that is driven member during with the mensuration of carrying out the AF evaluation of estimate once more is defined as in driving direction or the contrary direction any one; And determination step again, wherein the driving pulse control part makes by each regulation number of drive pulses on one side and is driven member moves the position that is driven behind the member from contrary direction detection step, move to the moving direction that is determined, on one side in each AF evaluation of estimate of measuring once more when mobile.
In addition, above-mentioned " AF evaluation of estimate " for example as the contrast value that is obtained by the image of taking by means of lens, is meant employed evaluation of estimate in the focusing action of lens, and this AF evaluation of estimate is high more, and the degree that is evaluated as in focus is high more.
Driving control device or the drive controlling method related according to the invention described above, driving pulse control part make by each regulation number of drive pulses on one side and are driven member and move to driving direction, on one side in each AF evaluation of estimate of measuring regulation when mobile.Then, the driving pulse control part is according to the direction towards the peaked position of the AF evaluation of estimate that has obtained obtaining in the driving direction that is driven member moves, make the mode that member returns to contrary direction that is driven, the supply of controlling and driving pulse, and in the position mensuration AF evaluation of estimate of returning after stopping, and then, Yi Bian number of drive pulses makes from this position and is driven member and moves stipulated number to contrary direction in accordance with regulations, on one side in each mensuration AF evaluation of estimate when mobile.Then, each AF evaluation of estimate that the driving pulse control part obtains in moving according to the maximal value of the AF evaluation of estimate that obtains in the driving direction that is driven member moves and the contrary direction that is being driven member, condition according to the rules, the moving direction that is driven member during with the mensuration of carrying out the AF evaluation of estimate once more be defined as driving direction or backward any one.Then, the driving pulse control part makes by each regulation number of drive pulses on one side and is driven the position of member after move and moves to the moving direction that is determined, on one side in each AF evaluation of estimate of measuring once more when mobile.
Like this, in the present invention, each the AF evaluation of estimate that obtains in moving according to the maximal value of the AF evaluation of estimate that in the driving direction that is driven member moves, obtains and the contrary direction that is being driven member, the moving direction that is driven member during with the mensuration of carrying out the AF evaluation of estimate once more, be defined as driving direction or backward one of them, carry out the mensuration of AF evaluation of estimate once more.Thus, because the peak of AF evaluation of estimate is specific more reliable, so, even when low-light level or during low contrast, also can realize more high-precision AF search.
According to the present invention,, also can realize more high-precision AF search even when low-light level or during low contrast.
Another other the side according to the present invention, driving control device possesses: along the flexible electricapparatus conversion element of prescribed direction, be fixed on the drive member of an end of the electricapparatus conversion element of prescribed direction, the driving pulse control part that the driving pulse of supplying with subtend electricapparatus conversion element is controlled, the driving pulse control part is according to making along the extension speed mode different with contraction speed of the electricapparatus conversion element of prescribed direction, the supply of controlling and driving pulse, make the electricapparatus conversion element flexible, thus, make the drive member vibration along prescribed direction, thereby make and comprise the member that is driven that constitutes with the lens of this drive member friction apply and move along prescribed direction, the driving pulse control part comprises: actual number of drive pulses is measured mechanism, it is before the focusing action beginning of lens, at with this focusing action in the driving direction contrary direction that is driven member, measure actual making and be driven member and move the needed actual number of drive pulses of regulation displacement; Correction coefficient is calculated mechanism, and it is at contrary direction, based on actual number of drive pulses that is obtained by mensuration and predetermined basic pulse number, calculates and is used for number of drive pulses and is driven the correction coefficient that the relation between the displacement of member is proofreaied and correct; The AF evaluation of estimate is measured mechanism, for the focusing action of lens, by each regulation number of drive pulses make this be driven member to driving direction to move on one side, on one side in each AF evaluation of estimate of measuring the regulation that the image taken by these lens obtains; Aligning gear, based on calculate the correction coefficient that mechanism calculates by correction coefficient, to with proofread and correct by the peaked position of the AF evaluation of estimate of the measuring gained corresponding mobile umber of pulse of displacement till the starting position of measuring again of measuring mechanism based on the AF evaluation of estimate from having obtained, measured again and used umber of pulse; Light-measuring mechanism carries out instrumentation to the brightness of reference object; With mobile control gear, mensuration success before measuring mechanism based on the AF evaluation of estimate situation under, and during the mensuration success from measure mechanism based on the AF evaluation of estimate before under the elapsed time situation at the appointed time of process, and the variation of the AF evaluation of estimate that when the success of this mensuration of what is called, obtains in first specialized range first condition and the so-called brightness variation that obtains based on the instrumentation of light-measuring mechanism should mensurations success the time in the second condition of second specialized range both sides or during side abundance, according to from having obtained measuring the peaked position of AF evaluation of estimate of the mensuration gained of mechanism based on the AF evaluation of estimate, based on the umber of pulse of mensuration again that obtains by the correction of aligning gear, make and be driven the mode that member returns to contrary direction, the supply of controlling and driving pulse; Be driven member based on mobile control gear after contrary direction is returned, the AF evaluation of estimate is measured mechanism this position after be driven member and return, the mensuration of the AF evaluation of estimate of stipulating once more.
And, drive controlling method involved in the present invention, possessing: along the flexible electricapparatus conversion element of prescribed direction, be fixed on the drive member of an end of the electricapparatus conversion element of prescribed direction, with the controlling and driving pulse in the driving control device of the driving pulse control part of the supply of electricapparatus conversion element, by utilizing the driving pulse control part, according to making along the extension speed mode different of the electricapparatus conversion element of prescribed direction with contraction speed, the supply of controlling and driving pulse, make the electricapparatus conversion element flexible, thus, make the drive member vibration along prescribed direction, thereby make and comprise the member that is driven that constitutes with the lens of this drive member friction apply and move along prescribed direction, described drive controlling method comprises: actual number of drive pulses determination step, wherein before the focusing action beginning of lens, the driving pulse control part at this focusing action in the direction of the driving direction contrary that is driven member, measure actual making and be driven member and move the needed actual number of drive pulses of regulation displacement; Correction coefficient is calculated step, wherein the driving pulse control part is at contrary direction, based on actual number of drive pulses that obtains by mensuration and predetermined basic pulse number, calculate and be used for number of drive pulses and be driven the correction coefficient that the relation between the displacement of member is proofreaied and correct; AF evaluation of estimate determination step, the driving pulse control part is for the focusing action of lens, on one side make this be driven member and move to driving direction by each regulation number of drive pulses, in this each measure the AF evaluation of estimate of regulation that image by this lens shooting obtain on one side; Aligning step, wherein the driving pulse control part is based on calculated the correction coefficient that step is calculated by correction coefficient, to with from the peaked position of the AF evaluation of estimate that obtained obtaining to the starting position of measuring again of AF evaluation of estimate by mensuration till the corresponding mobile umber of pulse of displacement proofread and correct, measured again and used umber of pulse; The photometry step is carried out instrumentation to the brightness of reference object; With mobile controlled step, in the mensuration before AF evaluation of estimate determination step success situation under, and during the success of the mensuration before the AF evaluation of estimate determination step under the elapsed time situation at the appointed time of process, and the variation of the AF evaluation of estimate that obtains when so-called this mensuration success is when being arranged in the both sides of the first condition of first specialized range and the second condition that the so-called brightness variation that obtains based on the instrumentation of photometry step should mensurations success the time is positioned at second specialized range or side abundance, the driving pulse control part is according to the resulting peaked position that obtains the AF evaluation of estimate of the mensuration from AF evaluation of estimate determination step, based on the umber of pulse of mensuration again that obtains by aligning step, make and be driven the mode that member returns to contrary direction, the supply of controlling and driving pulse; Determination step again, the driving pulse control part be driven member by mobile controlled step after contrary direction is returned, this position after be driven member and return, the mensuration of the AF evaluation of estimate of stipulating once more.
According to above-mentioned driving control device involved in the present invention or drive controlling method, before the focusing action beginning of lens, the driving pulse control part is at the direction of the driving direction contrary that is driven member in moving with this focusing, mensuration makes and is driven the needed actual number of drive pulses of the actual mobile regulation displacement of member, at this contrary direction, based on actual number of drive pulses that obtains by mensuration and predetermined basic pulse number, calculate and be used for number of drive pulses and be driven the correction coefficient that the relation between the member displacement is proofreaied and correct.Then, the driving pulse control part is for the focusing of lens action, by each regulation number of drive pulses make this be driven member to driving direction to move on one side, in moving at every turn, this measures the AF evaluation of estimate of the regulation that the image by this lens shooting obtains on one side.Then, the driving pulse control part is based on the correction coefficient of being calculated by the driving pulse control part, to peaked position from the AF evaluation of estimate that obtained obtaining by mensuration, the pairing mobile umber of pulse of displacement till the starting position of measuring again of AF evaluation of estimate is proofreaied and correct, and is measured and uses umber of pulse.Then, the driving pulse control part carries out instrumentation to the brightness of reference object.Here, in the mensuration before AF evaluation of estimate determination step success situation under, and under the elapsed time situation at the appointed time of when success process of the mensuration before AF evaluation of estimate determination step, and first condition and the brightness that when this mensurations success based on the instrumentation of photometry step obtains when changing both sides in the second condition of second specialized range or side abundance of the variation of the AF evaluation of estimate that obtains during so-called this mensuration success in first specialized range, driving pulse portion, according to from obtained by the peaked position of the AF evaluation of estimate of measuring gained based on described measure again to make with umber of pulse be driven the mode that member returns to contrary direction, the supply of controlling and driving pulse.Then, be driven member after contrary direction is returned, driving pulse control part this position after be driven member and return, the mensuration of the AF evaluation of estimate of stipulating once more.
Like this, in the present invention, be driven member, return to contrary direction based on measuring again with umber of pulse from having obtained the peaked position of AF evaluation of estimate.Then, this position after be driven member and return, the mensuration of the AF evaluation of estimate of stipulating once more.Thus, compare, can dwindle the driving scope that is driven member, therefore, can shorten being driven member and focusing on the needed driving time of execution that drives with being driven the situation that member turns back to the starting position of focusing action.
In addition, for example, preferably include aforesaid driving control device with the such portable optical apparatus of the mobile telephone terminal of camera.Thus, because in such portable optical apparatus, be driven member and focus on the needed driving time of execution that drives and also be shortened, so, the convenience of such portable optical apparatus improved.
According to the present invention, can shorten being driven the needed driving time of execution that member focuses on driving.
Description of drawings
Fig. 1 is the exploded perspective view of an example of the related driving control device 20 of expression first embodiment.
Fig. 2 is the functional block diagram relevant with driving control device 20.
Fig. 3 is the chart of the output signal of the photoelectric chopper (interrupter) that comprised from position transducer 32 (132,232) of expression.
Fig. 4 is the process flow diagram of the base conditioning action in the expression driving control device 20.
Fig. 5 is the process flow diagram of expression temperature correction action.
Fig. 6 is the chart of expression from the variation of output signals (variation) of the photoelectric chopper that can use first embodiment.
Fig. 7 is the functional block diagram relevant with the related driving control device of second embodiment 120.
Fig. 8 is the process flow diagram of the processing action in the expression driving control device 120.
Fig. 9 is the moving direction of expression lens and as the chart of the relation between the AF evaluation of estimate of focus.
Figure 10 is that the expression moving direction determines that mechanism 135 determines the table of the condition of lens moving direction.
Figure 11 is the moving direction of expression lens and as the chart of the relation between the AF evaluation of estimate of focus.
Figure 12 is the functional block diagram relevant with the related driving control device of the 3rd embodiment 220.
Figure 13 is the process flow diagram of the processing action in the expression driving control device 220.
Figure 14 is the expression direction that moves of lens and as the chart of the relation between the AF evaluation of estimate of focus.
Embodiment
(first embodiment)
Below, with reference to Fig. 1～Fig. 6, first embodiment of the present invention is described.
[summary of driving control device constitutes]
Fig. 1 represents the exploded perspective view of an example of driving control device involved in the present invention 20.In Fig. 1, driving control device 20 comprises: be built-in with the guide pole 3 that conduct is driven lens barrel 1, the supporting lens barrel 1 of the lens 21 (Fig. 2) of member and guides lens barrel 1 along the optical axis direction of lens 21.In the hole 1d of the hole 1b of the teat 1a in lens barrel 1 left side and teat 1c, the lens barrel supporting member that is inserted with supporting lens barrel 1 and lens barrel 1 is axially moved is held concurrently and is driven rod 17, and this drivings rod 17 (hereinafter to be referred as doing " driving rod ") direction of principal axis is inserted among the hole 13d of the hole 13b of the first erection part 13a that is formed at the excellent supporting member 13 of driving and the second erection part 13c movably.And, it is further rearward more outstanding than the second erection part 13c that this drives excellent supporting member 13 to drive rod 17, the rear end of this driving rod is fixed on the front end of piezoelectric element 12, and this 3rd erection part 13e that drives excellent supporting member 13 is close in the rear end of described piezoelectric element 12.
Below the teat 1a of lens barrel 1 and 1c, be formed with vertical threaded hole, have respectively at two ends and mesopore (the バ カ hole) 14a of the position consistency of threaded hole and the rectangle leaf spring 14 of 14b, by screw 15 and 16 and drive rod 17 be installed in abreast teat 1a and 1c below.Centre at leaf spring 14 is formed with outstanding bend 14c up, and this bend 14c is crimped in the centre position of teat 1a and 1c and drives below excellent 17.Therefore, in each of the hole 1d of the hole of teat 1a 1b and teat 1c, drive rod 17 and upwards pushed, drive the elastic force of the outer peripheral face of excellent 17 upsides, be crimped on hole 1b and the 1d inner peripheral surface of upside separately based on leaf spring 14.Therefore, be applied in direction of principal axis power below the friction force that drives rod 17 at the friction force of hole 1b and 1d and driving rod 17 and bend 14c and drive at excellent 17 o'clock, lens barrel 1 and driving rod 17 become one and move, be applied in excellent 17 o'clock of driving in this direction of principal axis power more than friction force, only have the rod of driving 17 axially to move.In addition, w1 and w2 are the leads that is used for piezoelectric element 12 power supplies.
Then, the effect that friction apply is driven the leaf spring 14 of rod 17 and lens barrel 1 describes.Drive rod 17 in order stably to produce friction force and not act on the displacement direction of lens barrel 1, putting on to the elastic force near normal of leaf spring 14 based on the elastic force of leaf spring 14.And if because of flexible leaf spring 12 elastic deformation on the flexible direction of piezoelectric element 12 that makes of piezoelectric element 12, the friction force that then drives rod 17, lens barrel 1 changes, and elastic force acts on the displacement direction of lens barrel 1, makes the displacement instability of lens barrel 1.For this being prevented leaf spring 14 has the planar portions parallel with the flexible direction of piezoelectric element 12, has big rigidity in this direction.
[the functional formation of driving control device]
Fig. 2 represents the functional block diagram relevant with driving control device 20.As shown in Figure 2, driving control device 20 possesses: be built in the lens barrel 1 of Fig. 1 lens 21, be used for along optical axis direction adjust the position of lens 21 driving rod 17, with drive rod 17 and be connected and have piezoelectric element 12 that makes the effect that this driving excellent 17 moves along optical axis direction and a driving pulse control part 30 that subtend piezoelectric element 12 supply drive pulses are controlled.Wherein, driving pulse control part 30, by according to making along the extension speed mode different of the piezoelectric element 12 of optical axis direction with contraction speed, the supply of controlling and driving pulse, make piezoelectric element 12 flexible, make thus to drive rod 17, thereby the lens barrel 1 (and built-in lens 21) that makes and drive excellent 17 friction applies is along optical axis direction, to moving near reference object (below be called " N direction ") and away from the direction of reference object (below be called " INF direction ") along the optical axis direction vibration.
And driving pulse control part 30 possesses known in the past photoelectric chopper (not shown) and based on the position transducer 32 that detects the position of lens 21 from the output signal of this photoelectric chopper (below be called " PI output ").As an example, PI exports as shown in Figure 3, by comprising a-quadrant as the H interval, D zone and as the B zone in L interval, the graphical presentation in C zone.Position transducer 32 has the function of measuring mechanism as actual number of drive pulses, described actual number of drive pulses was measured mechanism before the focusing action beginning of lens 21, at the driving direction (being the N direction of Fig. 3 here) of the lens 21 in this focusing action and the direction opposite (promptly with driving direction, the INF direction) each, measure the suitable umber of pulse (make the needed umber of pulse of the only mobile predetermined distance of lens 21 reality, be called " actual number of drive pulses " below) in a-quadrant respectively with Fig. 3.
In addition, driving pulse control part 30 also possesses: with the driving pulse feed mechanism 31 of driving pulse to piezoelectric element 12 supplies; Store the EEPROM36 that is used for the various settings such as basic pulse number that the aftermentioned correction coefficient calculates; Based on actual number of drive pulses and predetermined basic pulse number,, calculate the correction coefficient that is used for correction coefficient that the relation between the displacement of number of drive pulses and lens 21 is proofreaied and correct respectively and calculate mechanism 33 at N direction and INF direction; For lens 21 being moved based on the correction coefficient of calculating, the number of drive pulses aligning gear 34 that the number of drive pulses that subtend piezoelectric element 12 is supplied with is proofreaied and correct; Based on N direction and INF direction actual number of drive pulses and predetermined basic pulse number separately, obtain with actual number of drive pulses and basic pulse number deviate from relevant coefficient (thermometric coefficient), based on this thermometric coefficient and specified reference value, judge whether the correction decision mechanism 35 of the correction of number of drive pulses that need be corresponding with temperature variation.Certainly, be judged as the timing that need carry out the number of drive pulses corresponding with temperature variation, 34 pairs of number of drive pulses of number of drive pulses aligning gear are implemented the correction corresponding with temperature variation described later.
[the processing action in the driving control device]
Then, the action of the processing in the driving control device 20 is described.Fig. 4 represents the basic processing action.As shown in Figure 4, at first in step S1, position transducer 32 at each direction of N direction and INF direction, was measured the suitable actual number of drive pulses in a-quadrant with Fig. 3 respectively before the focusing action beginning of lens 21.That is, position transducer 32 is at first measured the actual number of drive pulses of N direction for the a-quadrant of Fig. 3, then the a-quadrant is measured the actual number of drive pulses of INF direction.
Particularly, as shown in Figure 3, when the determined position of the position transducer 32 in this moment is equivalent in the a-quadrant in the PI output, driving pulse control part 30 is according to the mode that lens 21 are moved along the N direction, beginning is supplied with to the driving pulse of piezoelectric element 12, if utilize position transducer 32 to detect H from PI output, then stop to supply with in the moment of having supplied with driving pulse with predetermined pulse (for example 10 pulses) from this down position to the decline of L (from the a-quadrant to the switching in C zone).Then, driving pulse control part 30 is according to the mode that lens 21 are moved to the N direction, and beginning is to piezoelectric element 12 supply drive pulses.If utilize position transducer 32 to detect H from PI output, then stop to supply with in the moment of having supplied with driving pulse with predetermined pulse (for example 10 pulses) from this down position to the decline of L (from the a-quadrant to the switching in B zone).Then, driving pulse control part 30 is according to the mode that lens 21 are moved along the N direction, beginning is to piezoelectric element 12 supply drive pulses, detect the time point to the rising (from of the switching of B zone) of H at position transducer 32 to the a-quadrant from the L of PI output, begin the counting of actual number of drive pulses, then, constantly, finish the counting of actual number of drive pulses at the H that detects from PI output to the decline of L (from the a-quadrant to the switching in C zone).Like this, determine the actual number of drive pulses P1 of N direction NEqually, at driving pulse control part 30 according to lens 21 have been begun after piezoelectric element 12 supply drive pulses to the mode that the INF direction moves, when position transducer 32 detects L from PI to the rising (from the switching of C zone to the a-quadrant) of H, begin the counting of actual number of drive pulses, then, detecting H from PI output when the decline of L (from the a-quadrant to the switching in B zone), finish the counting of actual number of drive pulses.Like this, determine the actual number of drive pulses PI of INF direction INF
In the following step S2 of Fig. 4, correction coefficient is calculated mechanism 33 and is read the N directional reference umber of pulse P2 that asks for the normal temperature collection from EEPROM36 NWith INF directional reference umber of pulse P2 INF, in following step S3, correction coefficient is calculated mechanism 33 based on following formula (1), (2), calculates the correction coefficient K relevant with the number of drive pulses of N direction N, the correction coefficient K relevant with the number of drive pulses of INF direction INF
K N＝P1 N/P2 N …(1)
K INF＝P1 INF/P2 INF …(2)
In following step S4, number of drive pulses aligning gear 34 is read predefined N direction setting umber of pulse P3 from EEPROM36 NWith INF direction setting umber of pulse P3 INF, in following step S5, number of drive pulses aligning gear 34 is based on following formula (3), (4), the number of drive pulses P4 that calculates the N direction NNumber of drive pulses P4 with the INF direction INF
P4 N＝P3 N×K N …(3)
P4 INF＝P3 INF×K INF …(4)
As mentioned above, obtained the number of drive pulses P4 of N direction NNumber of drive pulses P4 with the INF direction INFAfter, can in the focusing of lens 21 action, use the number of drive pulses P4 of above-mentioned N direction NNumber of drive pulses P4 with the INF direction INF
Like this, in driving control device 20, owing to needn't carry out the focusing action of lens 21 simultaneously, but before focusing action beginning, the number of drive pulses that subtend piezoelectric element 12 is supplied with for lens 21 are moved is proofreaied and correct, so, while do not need can constitute by the CPU of cheapness and realize as action the CPU the prior art of controlling and driving umber of pulse at every moment that focuses with multitask ability.And, owing to before the action beginning of focusing, finished the correction of number of drive pulses, so, can just realize the drive controlling of the above precision of regulation grade from the starting stage of focusing action.
In addition, the step S1 of Fig. 4 is equivalent to actual number of drive pulses determination step involved in the present invention, and step S2 and step S3 are equivalent to correction coefficient and calculate step, and step S4 and step S5 are equivalent to the driving pulse aligning step.
In addition, also can handle on the basis, carry out temperature correction shown in Figure 5 in the action of earlier figures 4.Promptly, in the step S6 of Fig. 5, proofread and correct decision mechanism 35 based on following formula (5), calculate as with actual number of drive pulses and basic pulse number between the thermometric coefficient D that deviates from relevant predetermined coefficients, and, read to become from EEPROM36 and be used to be judged as the high temperature judgment standard E that needs the benchmark that high temperature proofreaies and correct H, and become and be used to be judged as the low temperature judgment standard E that needs the benchmark that low temperature proofreaies and correct L
D＝(P1 N+P1 INF)/(P2 N+P2 INF)…(5)
Then, in following step S7, proofread and correct decision mechanism 35 and judge that whether the thermometric coefficient D that calculates is than high temperature judgment standard E H(that is, need high temperature to proofread and correct) greatly.Be judged as thermometric coefficient D at high temperature judgment standard E HUnder the above situation, enter step S10 described later, carry out high temperature and proofread and correct.
On the other hand, but in step S7, be judged as thermometric coefficient D at high temperature judgment standard E HWhen following, enter step S8, proofread and correct decision mechanism 35 and judge that whether the thermometric coefficient D that calculates is less than low temperature judgment standard E L(that is, needing low temperature to proofread and correct).Be judged as thermometric coefficient D less than low temperature judgment standard E LSituation under, enter step S9 described later, carry out low temperature and proofread and correct.
Be positioned at low temperature judgment standard E when in step S8, being judged as thermometric coefficient D LWhen above, owing to do not need high temperature to proofread and correct and the low temperature correction, so, finish the processing of Fig. 5.
When in step S7, being judged as thermometric coefficient D at high temperature judgment standard E HWhen above, in step S10, the number of drive pulses P4 of 34 pairs of N directions of number of drive pulses aligning gear NNumber of drive pulses P4 with the INF direction INFCarrying out high temperature proofreaies and correct.For example, number of drive pulses aligning gear 34 is read the N direction of obtaining and be stored in EEPROM36 in advance, the high temperature separately of INF direction is proofreaied and correct with umber of pulse adjusted value F N, F INF, and the high temperature of N direction proofreaied and correct with umber of pulse adjusted value F NBe added to number of drive pulses P4N, the high temperature of INF direction proofreaied and correct be added to number of drive pulses P4 with umber of pulse adjusted value FINF INF, can carry out high temperature thus and proofread and correct.
On the other hand, when in step S8, being judged as thermometric coefficient D less than low temperature judgment standard E LThe time, in step S9, the number of drive pulses P4 of 34 pairs of N directions of number of drive pulses aligning gear NNumber of drive pulses P4 with the INF direction INFCarrying out low temperature proofreaies and correct.For example, can read N direction, the INF direction low temperature separately of obtaining and be stored in EEPROM36 in advance by number of drive pulses aligning gear 34 proofreaies and correct with umber of pulse adjusted value G N, G INF, and the low temperature of N direction proofreaied and correct with umber of pulse adjusted value G NBe added to number of drive pulses P4 N, the low temperature of INF direction is proofreaied and correct with umber of pulse adjusted value G INFBe added to number of drive pulses P4 INF, carry out low temperature thus and proofread and correct.
By like this number of drive pulses being implemented the correction corresponding with temperature variation, can realize more high-precision drive controlling.In addition, the step S6 of Fig. 5～S8 is equivalent to correction determining step involved in the present invention, and step S9 and step S10 are equivalent to the temperature correction step.
At last, the variation that can use PI output of the present invention is described.Fig. 6 represents to use 6 kinds (Class1～6) of PI output of the present invention.In Class1 shown in Figure 6～4, because rising part and sloping portion by utilizing the two ends, a-quadrant, can carry out the mensuration of the actual number of drive pulses (the actual number of drive pulses that is equivalent to the a-quadrant of Fig. 3) of N direction in the step S1 of described Fig. 4 and INF direction, so the present invention can be used in Class1～4.
On the other hand, in type 5,6, only there be a kind of of rising part or sloping portion.But, for example in type 5, detecting from the B zone afterwards to the switching (rising part) of a-quadrant, only drive the umber of pulse of regulation along the N direction, drive to the INF direction then, begin to detecting from the a-quadrant to switching (sloping portion) the actual number of drive pulses P1 before in B zone as long as determine from this driving INFGet final product.Under this situation, if will be made as P1 to the predetermined pulse number of N direction N, then can be to obtain the number of drive pulses P4 of N direction with the same order of Fig. 4 NNumber of drive pulses P4 with the INF direction INFIn type 6, too, can obtain the number of drive pulses P4 of N direction NNumber of drive pulses P4 with the INF direction INFThat is, type 5,6 also can adopt the present invention.
In addition, in the above-described first embodiment, for example understand, be not limited to lens but conduct is driven member as being driven the example that member drives lens, the cutting member of work mechanism that needs hi-Fix as being driven member, also can be used the present invention.
(second embodiment)
; open among the clear 63-157578 the spy; following technology is disclosed: promptly by each regulation number of drive pulses lens are moved along prescribed direction on one side; and the AF evaluation of estimate (for example contrast value) to the regulation that obtained by the image of taking via these lens is measured in this is each; asking for this AF evaluation of estimate becomes maximum position, and carries out the focusing of lens by making lens move to this position.Open among the clear 63-157578 the spy, because locating of AF evaluation of estimate separates with predetermined distance, so, in order further to focus accurately, in the mensuration (AF search) of AF evaluation of estimate afterwards, make lens return operation till the peak of AF evaluation of estimate along the contrary direction.
But, in JP Hei.11-356070A (U.S.Patent No.6,249,093), do not mention the control of carrying out above-mentioned return.
And, in the automatic focusing device that JP 2002-72073 is put down in writing, by current position based on lens, judgement is to search for towards carrying out AF the most nearby after temporary transient focusing is urged to infinity, still after temporary transient focusing is urged to the most nearby, carry out the AF search, carry out this AF search towards infinity.Then, after this AF search finishes, make lens to the peak that returns against direction up to the AF evaluation of estimate.But, when the dark situation of reference object etc., low-light level or during low contrast, be difficult to the peak of specific AF evaluation of estimate, can cause the AF search accuracy to reduce.
The purpose of second embodiment is, even provide a kind of when low-light level or during low contrast, also can realize the driving control device and the drive controlling method of more high-precision AF search.
The summary of the summary of the drive unit 120 of second embodiment and the drive unit 20 of first embodiment is roughly the same.That is, the exploded perspective view of drive unit 120 example and Fig. 1 are roughly the same.Therefore, omitted explanation based on the exploded perspective view of drive unit 120.
[functional structure of driving control device]
Fig. 7 represents the functional block diagram relevant with driving control device 120.As shown in Figure 7, driving control device 120 possesses: be built in the lens 21 in the lens barrel 1 of Fig. 1; Imaging apparatus 122 via lens 21 photographic images; The Flame Image Process of stipulating for the view data that obtains based on the shooting of imaging apparatus 122, with the view data after this Flame Image Process to the Flame Image Process mechanism 123 along direction detection mechanism 131 and 134 outputs of contrary direction detection mechanism described later; Be used for adjusting the driving rod 17 of the position of lens 21 along optical axis direction; With drive rod 17 and be connected and have a piezoelectric element 12 that makes the effect that this driving excellent 17 moves along optical axis direction; With the driving pulse control part 130 of control to piezoelectric element 12 supply drive pulses.Wherein, driving pulse control part 130 is by according to making along the extension speed mode different with contraction speed of the piezoelectric element 12 of optical axis direction, the supply of controlling and driving pulse makes piezoelectric element 12 flexible, thereby the lens barrel 1 (and built-in lens 21) that is comprising the formation with the lens 21 that drive excellent 17 friction applies is moved to N direction and INF direction along optical axis direction.
And driving pulse control part 130 possesses known in the past photoelectric chopper (not shown) and based on the position transducer 132 that detects the position of lens 21 from the output signal of this photoelectric chopper (below be called " PI output ").About PI output, as an example as shown in Figure 3, represent by comprising as the a-quadrant in H interval and D zone and as the chart in the B zone in L interval, C zone.Position transducer 132 is measured mechanism as actual number of drive pulses and is had following function, promptly before the focusing action beginning of lens 21, at the driving direction (being the N direction of Fig. 3 here) of the lens 21 in this focusing action and the direction (be INF direction) opposite with driving direction, measure the suitable umber of pulse (make the needed umber of pulse of the only mobile predetermined distance of lens 21 reality, be called " actual number of drive pulses " below) in a-quadrant respectively with Fig. 3.
In addition, driving pulse control part 130 also possesses: EEPROM136, suitable direction detection mechanism 131, mobile control gear 133 (inverse move control gear), contrary direction detection mechanism 134 and moving direction are determined mechanism 135.EEPROM136 stores in advance: position transducer 132 employed predetermined pulse numbers described later, basic pulse number (that is N directional reference umber of pulse P2 that asks for the normal temperature collection, NWith INF directional reference umber of pulse P2 INF) wait various settings.Along direction detection mechanism 131, make lens 21 by each regulation number of drive pulses on one side, the driving direction (that is, the N direction) of the lens 21 in lens 21 focusing action moves, on one side in each regulation AF evaluation of estimate that is obtained by the image of taking via lens 21 of measuring when mobile.The measurement result of mobile control gear 133 position-based sensors 132 is according to the supply that makes lens 21 to the mobile mode controlling and driving pulse of driving direction (being the N direction) or contrary direction (INF direction).For example, mobile control gear 133 supply of controlling and driving pulse as follows:, lens 21 are returned to contrary direction (being the INF direction) promptly towards utilizing the direction that obtains the peaked position of AF evaluation of estimate along direction detection mechanism 131.Contrary direction detection mechanism 134, measure the AF evaluation of estimate in the position of returning by means of the control of mobile control gear 133 and stopping, and with each predetermined pulse number lens 21 are moved with stipulated number from this position to contrary direction (being the INF direction) on one side, each move in measure AF evaluation of estimate on one side.Moving direction determines that mechanism 135 is according to the maximal value of the AF evaluation of estimate of utilizing suitable direction detection mechanism 131 to obtain and each AF evaluation of estimate of utilizing contrary direction detection mechanism 134 to obtain, based on rated condition described later, the moving direction of the lens 21 during with the mensuration of carrying out the AF evaluation of estimate once more, be defined as lens 21 driving direction or backward one of them.In addition, based on determine mechanism's 135 determined moving directions by moving direction, along direction detection mechanism 131 or contrary direction detection mechanism 134, from the position of mobile lens is measured once more by contrary direction detection mechanism 134.
[the processing action in the driving control device]
Below, the processing of driving control device 120 action is described.Fig. 8 represents the basic processing action.As shown in Figure 8, at first in step S11, position transducer 132 was measured the actual number of drive pulses of the a-quadrant that is equivalent to Fig. 3 respectively at N direction and INF direction before the focusing action beginning of lens 21.That is, position transducer 132 is at first measured the actual number of drive pulses P1 of N direction for the a-quadrant of Fig. 3 N, follow the actual number of drive pulses P1 that the a-quadrant is measured the INF direction INFThe step S1 of the details of step S11 and first embodiment (with reference to Fig. 4) is roughly the same.Therefore, omit its explanation.
In the following step S12 of Fig. 8, by each regulation number of drive pulses lens 21 are moved to the driving direction (being the N direction) of lens 21 on one side along direction detection mechanism 131, on one side in its each AF evaluation of estimate of measuring regulation when mobile.Then, in following step S13, mobile control gear 133 supply of controlling and driving pulse as follows: promptly, return to contrary direction (being the INF direction) to make lens 21 at a high speed towards utilizing the peaked position that obtains the AF evaluation of estimate along direction detection mechanism 131.The details that lens 21 are returned to contrary direction will be narrated in the back.
In following step S14, contrary direction detection mechanism 134, measure the AF measured value in the position that the result who returns by means of mobile control gear 133 stops, and with each regulation number of drive pulses lens 21 are moved with stipulated number from this position to contrary direction (being the INF direction) on one side, on one side this move each, measure the AF evaluation of estimate.In addition, resulting AF evaluation of estimate all than the little situation of setting (that is, the maximal value VP/ coefficient of determination J of resulting AF evaluation of estimate) under, make a mistake.Then, in following step S15, moving direction determines that mechanism 135 is according to the maximal value of the AF evaluation of estimate of utilizing suitable direction detection mechanism 131 to obtain and each AF evaluation of estimate of utilizing contrary direction detection mechanism 134 to obtain, based on rated condition described later, to carry out the moving direction of the lens 21 in the mensuration of AF evaluation of estimate once more, be defined as the driving direction of lens 21 or contrary direction one of them.
In following step S16, when the moving direction that is determined was driving direction (being the N direction), moving direction was determined 135 pairs of suitable direction detection mechanisms of mechanism, 131 indications mensuration once more.Then, enter step S17.On the other hand, when the moving direction that is determined was contrary direction (being the INF direction), moving direction determined that 134 indications of 135 pairs of contrary direction detection mechanisms of mechanism measure again.Then, enter step S18.
In step S17,,, carry out aforesaid mensuration once more from utilizing the position of contrary direction detection mechanism 134 mobile lens 21 along direction detection mechanism 131.In addition, in step S18, contrary direction detection mechanism 134 carries out aforesaid mensuration once more from utilizing the position of contrary direction detection mechanism 134 mobile lens 21.When based on measuring once more when having obtained maximal value, carrying out with this maximal value is the interpolation operation at center.Then, make lens 21 move to the position corresponding with the maximal value that obtains by interpolation operation.In addition, also can after step S17 or step S18, turn back to step S12.
In addition, the step S12 of Fig. 8 is equivalent to suitable direction detection step involved in the present invention, and step S13 is equivalent to the inverse move controlled step, and step S14 is equivalent to contrary direction detection step, and step S15 is equivalent to the moving direction determining step.And step S16 and S17 and step S16 and step S18 are equivalent to determination step again.In addition,, there be the discrete of brightness owing to, utilize each frame of measuring along direction detection mechanism 131 and contrary direction detection mechanism 134 to after driving control device 120 energized, so, after this deviation is stable, execution in step S12 and S14.
Then, with reference to Fig. 9 explanation a example: promptly mobile control gear 133 according to the mode of the supply of following such controlling and driving pulse, towards utilizing the peaked position that has obtained the AF evaluation of estimate along direction detection mechanism 131, lens 21 are returned to contrary direction (being the INF direction).Fig. 9 represents the chart of the relation between the AF evaluation of estimate (longitudinal axis) of direction (transverse axis) that lens 21 move based on the 133 performed processing actions of the mobile control gear focus with as the detection focus time.In addition, the afore mentioned rules number of times is made as 1 here and describes, but be not defined in this especially.Fig. 9 (a) is illustrated in based on along in the mensuration of direction detection mechanism 131, has obtained the chart of the peaked situation of an AF evaluation of estimate, and Fig. 9 (b) is the chart that expression has obtained the situation of continuous 3 maximal values (being identical big value entirely).Shown in Fig. 9 (a), lens 21 are towards the direction of the peaked position that has obtained the AF evaluation of estimate (being P), move (S13 of Fig. 8) along contrary direction (being the INF direction), after the position of P second locate (being D1) stop.In addition, P is peaked position in the focusing driving scope of lens 21, that obtained the AF evaluation of estimate.If carry out the mensuration of the AF evaluation of estimate at D1 place, then then lens 21 can further move to D2 to contrary direction (being the INF direction), carry out the mensuration (S14 of Fig. 8) of the AF evaluation of estimate at D2 place.
Then, shown in Fig. 9 (b), describe having obtained continuous a plurality of peaked situation.Here, three the peaked situations that obtained are described.In addition, the peaked position that has obtained the most close N direction side is made as P1, arranges continuously according to the order of P2, P3 to the INF direction from P1.Under this situation, lens 21 move (S13 of Fig. 8) towards the direction of the position (being P1) of the most close N direction side to contrary direction (being the INF direction), and twice locate (being D1) after the position of P1 located to stop.Mobile control gear 133 after this is same with aforesaid situation.
Then, with reference to Figure 10 and Figure 11, moving direction is determined mechanism 135 according to by the maximal value of the AF evaluation of estimate that obtains along direction detection mechanism 131 and each the AF evaluation of estimate that is obtained by contrary direction detection mechanism 34, determine to describe for the condition of the moving direction that carries out the lens 21 of AF evaluation of estimate when measuring once more.Figure 10 represents that moving direction determines that mechanism 135 determines the condition of the moving direction of lens 21.Figure 11 is expression, the moving direction (transverse axis) of lens 21 corresponding with each condition shown in Figure 10 and the chart of the relation between the AF evaluation of estimate (longitudinal axis).In addition, the position that will stop because of the result that mobile control gear 133 is returned is made as D1.And, the maximal value of AF evaluation of estimate is made as VP, the AF evaluation of estimate that obtains once more among the aforesaid D1 is made as VD1, the AF evaluation of estimate that obtains once more among the aforesaid D2 is made as VD2.
As shown in figure 10, the condition of determining moving direction has 4 (No.1～4).In addition, No.1 represents that lens 21 stop at the situation of the position that locates after the most close twice from the peaked position (being peak) that has obtained the AF evaluation of estimate.In addition, No.2～4 are represented situation that lens 21 have stopped from peak to the most close previous position that locates respectively, situation about having stopped from peak once position that locates after the most close and situation about having stopped at the most close peak.At first, the condition to No.1 describes.VP greater than VD2, VD2 situation greater than VD1 under, shown in Figure 11 (1), the moving direction of lens 21 is defined as the INF direction.Then, based on the INF direction, carry out the mensuration again of AF evaluation of estimate from the position of D2.Then, the condition to No.2 describes.VP greater than VD1, VD1 situation greater than VD2 under, shown in Figure 11 (2), the moving direction of lens 21 is defined as the N direction.Then, based on the N direction, carry out the mensuration again of AF evaluation of estimate from the position of D2.Then, the condition of No.3 is described, more than the VP, under the situation of VP greater than VD1, shown in Figure 11 (3), the moving direction of lens 21 is defined as the INF direction at VD2.Then, based on the INF direction, carry out the mensuration again of AF evaluation of estimate from the position of D2.Then, the condition to No.4 describes.More than the VP, under the situation of VP greater than VD2, shown in Figure 11 (4), the moving direction of lens 21 is defined as the N direction at VD1.Then, based on the N direction, carry out the measurement again of AF evaluation of estimate from the position of D2.
As mentioned above, according to the maximal value of the AF evaluation of estimate that in the driving direction (being the N direction) of lens 21 is mobile, obtains and each the AF evaluation of estimate that in the contrary direction (being the INF direction) of lens moves, obtains, lens moving direction during with the mensuration of carrying out the AF evaluation of estimate once more be defined as driving direction or backward one of them, and carry out the mensuration of AF evaluation of estimate once more.Thus, because the peak of specific AF evaluation of estimate becomes more reliable, so, even when low-light level or during low contrast, also can realize more high-precision AF search.
In addition, for example also can comprise driving control device 120 with portable optical equipment such as the mobile telephone terminal of camera or digital cameras.In the portable optical apparatus that constitutes containing camera unit and power supply unit, this camera unit also can comprise driving control device 120.Under this situation, also can control connection, the disconnection of the power supply of camera unit.Thus, in such portable optical equipment, even during low-light level or during low contrast, also can realize more high-precision AF search.As a result, can improve convenience when using that such portable optical apparatus is photographed etc.
(the 3rd embodiment)
Needed driving time when shortening the driving that carry out to focus on, specified in more detail the drive condition when carrying out lens focus and driving be indispensable.But, in JP Hei.11-356070A (corresponding to U.S.Patent No.6,249,093), do not stipulate this drive condition.And, in the focus adjustment method that JP 2004-77959A (corresponding to US 2004/0212721 A) is put down in writing, because whenever by a shutter release button, the focusing that the driving scope of lens spreads all over broad range drives and must carry out 2 times, carries out needed driving time so be difficult to shorten focus on to drive.
The purpose of the 3rd embodiment is, driving control device, portable optical apparatus and the drive controlling method of the needed driving time of execution that can shorten the lens focus driving is provided.
The drive unit 20 of general and first embodiment of the drive unit 220 of the 3rd embodiment probably roughly the same.That is, the exploded perspective view of drive unit 220 example and Fig. 1 are roughly the same.Therefore, omission is based on the explanation of the exploded perspective view of drive unit 220.
[functional structure of driving control device]
Figure 12 represents the functional block diagram relevant with driving control device 220.As shown in figure 12, driving control device 220 possesses: the lens 21 that are built in the lens barrel 1 of Fig. 1; Imaging apparatus 222 via lens 21 photographic images; At the Flame Image Process that the view data that is obtained by the shooting of imaging apparatus 222 is stipulated, the view data after this Flame Image Process is measured the Flame Image Process mechanism 223 of mechanism 234 and light-measuring mechanism 235 outputs to AF evaluation of estimate described later; Be used for adjusting the driving rod 17 of the position of lens 21 along optical axis direction; With drive rod 17 and be connected and have a piezoelectric element 12 that makes the effect that this driving excellent 17 moves along optical axis direction; With the driving pulse control part 230 of control to piezoelectric element 12 supply drive pulses.Wherein, driving pulse control part 230 is by according to making along the extension speed mode different with contraction speed of the piezoelectric element 12 of optical axis direction, the supply of controlling and driving pulse, make piezoelectric element 12 flexible, thereby make 17 vibrations of driving rod along optical axis direction, thus, the lens barrel 1 (and built-in lens 21) that is comprising the formation with the lens 21 that drive excellent 17 friction applies is moved to N direction INF direction.
And driving pulse control part 230 possesses known in the past photoelectric chopper (not shown) and based on the position transducer 232 that detects the position of lens 21 from the output signal of this photoelectric chopper (below be called " PI output ").As an example of PI output as shown in Figure 3, by comprising a-quadrant as the H interval, D zone and as the B zone in L interval, the graphical presentation in C zone.Position transducer 232 has as actual number of drive pulses measures body function, described actual number of drive pulses was measured mechanism before the focusing action beginning of lens 21, at the driving direction (being the N direction of Fig. 3 here) of the lens 21 in this focusing action and the direction opposite (promptly with driving direction, the INF direction), measure the suitable umber of pulse (make the needed umber of pulse of the only mobile predetermined distance of lens 21 reality, be called " actual number of drive pulses " below) in a-quadrant respectively with Fig. 3.
In addition, driving pulse control part 230 also possesses: EEPROM236, correction coefficient are calculated mechanism 233, the AF evaluation of estimate is measured mechanism 234, aligning gear 237, mobile control gear 231 and light-measuring mechanism 235.EEPROM236 stores in advance: the basic pulse that is used to calculate correction coefficient M described later is counted R and lens 21 is turned back to the various settings such as mobile umber of pulse L of measuring the starting position again of AF evaluation of estimate from the peaked position that has obtained AF evaluation of estimate described later to contrary direction or driving direction.Correction coefficient is calculated mechanism 233 for contrary direction or driving direction, count R based on actual number of drive pulses Q that obtains by mensuration and predetermined basic pulse, calculate and be used for correction coefficient M that the relation between the displacement of number of drive pulses and lens 21 is proofreaied and correct.The AF evaluation of estimate is measured the focusing action of mechanism 234 for lens 21, by each regulation number of drive pulses lens 21 are moved to the driving direction or the contrary direction of regulation on one side, each measure the image by scioptics 21 taken and the AF evaluation of estimate (here be contrast value) of the regulation that obtain on one side.And, at lens 21 based on mobile control gear 231 described later and after contrary direction or driving direction returned, the position that the AF evaluation of estimate is measured after mechanism 234 returns from lens 21 these times was measured once more.Aligning gear 237 based on the correction coefficient M that calculates, is proofreaied and correct and is measured and use umber of pulse S mobile umber of pulse L.Displacement till described mobile umber of pulse and the starting position of measuring again of measuring mechanism 234 from the peaked position of the AF evaluation of estimate that obtained measuring gained to the AF evaluation of estimate is corresponding.Mobile control gear 231 under the situation that has satisfied rated condition (promptly be in based on the AF evaluation of estimate measure mensuration success before the mechanism 234 situation, and be in from based on the successful elapsed time of process constantly of the mensuration before the AF evaluation of estimate mensuration mechanism 234 being the situation in the stipulated time, and, the variation of resulting AF evaluation of estimate is positioned at the first condition of first specialized range when being in so-called this mensuration success, and the variation of the brightness that obtains based on the instrumentation of light-measuring mechanism 235 during so-called this mensuration success is arranged in the both sides of second condition of second specialized range or the situation of side abundance), driving pulse is controlled to the supply of piezoelectric element 12, so that make lens 21 from having obtained measuring the peaked position of AF evaluation of estimate of the mensuration gained of mechanism 234 based on the AF evaluation of estimate, based on the umber of pulse S of mensuration again that obtains by the correction of aligning gear 237, return to contrary direction or driving direction.The brightness of light-measuring mechanism 235 instrumentation reference objects.
[the processing action of driving control device]
Below, the processing of driving control device 220 action is described.Figure 13 represents the basic processing action.As shown in Figure 13, at first in step S21, mobile control gear 231 judges whether to satisfy above-mentioned rated condition.If satisfied this above-mentioned rated condition, then entered step S221.On the other hand, since when mensuration before, measure failure (taken place measure wrong) situation; The elapsed time of process has surpassed the situation of stipulated time during from the success of before mensuration; And make its AF evaluation of estimate that obtains when the mensuration success before surpass specialized range changing all the more more because of in AF detection information or monochrome information, exist changing, and, the brightness that obtains during the success of this mensuration surpasses specialized range all the more under the situation of changing more, do not satisfy this defined terms, therefore enter step S211.
In the step S211 of Figure 13, position transducer 232 was measured the actual number of drive pulses suitable with the a-quadrant of Fig. 3 respectively at N direction and INF direction before the focusing action beginning of lens 21.That is, position transducer 232 is at first measured the actual number of drive pulses of N direction to the a-quadrant of Fig. 3, then the a-quadrant is measured the actual number of drive pulses of INF direction.The step S1 of the details of step S211 and first embodiment (with reference to Fig. 4) is roughly the same.Therefore, omit its explanation.
In the following step S212 of Figure 13, correction coefficient is calculated mechanism 233 and is read the INF direction obtained with the normal temperature collection and the basic pulse of N direction is counted R from EEPROM36, in following step S213, correction coefficient is calculated mechanism 233 and is counted R based on the actual number of drive pulses Q of following formula (6), INF direction, the basic pulse of INF direction, calculates the correction coefficient M that is used for INF direction that the relation between the displacement of number of drive pulses and lens 21 is proofreaied and correct.Equally, correction coefficient is calculated mechanism 233 and is counted R based on the actual number of drive pulses Q of following formula (6), N direction, the basic pulse of N direction, calculates the correction coefficient M that is used for N direction that the relation between the displacement of number of drive pulses and lens 21 is proofreaied and correct.
M＝Q/R …(6)
In following step S214, the AF evaluation of estimate is measured the focusing action of mechanism 234 for lens 21, by each regulation number of drive pulses lens 21 are moved to the driving direction (being the N direction) of regulation on one side, in each measure the image by scioptics 21 taken and the regulation AF evaluation of estimate (here be contrast value) that obtain on one side.Here, used the correction coefficient M of the N direction of in above-mentioned steps S213, calculating.
In the step S221 of Figure 13, aligning gear 237 is read from EEPROM36, with from the peaked position of the AF evaluation of estimate that obtained measuring gained to measure based on the AF evaluation of estimate mechanism 234 measure again till the starting position displacement corresponding mobile umber of pulse L (promptly, the umber of pulse that lens 21 are returned to contrary direction (being the INF direction)), correction coefficient M based on following formula (7) and the INF direction calculated, mobile umber of pulse L is proofreaied and correct, measured again and use umber of pulse S.
S＝L×M …(7)
Then, in following step S222, mobile control gear 231, the driving pulse that subtend piezoelectric element 12 is supplied with is controlled, so that make, lens 21 are used umber of pulse S from having obtained the peaked position by the AF evaluation of estimate of measuring gained based on measuring again, return to contrary direction (being the INF direction).Here, used the correction coefficient M of the INF direction of in above-mentioned steps S213, calculating.Then, in step S223, the AF evaluation of estimate is measured mechanism 234 and is measured once more from the position that lens 21 these times are returned.Here, used the correction coefficient M of the N direction of in above-mentioned steps S213, calculating.
Thus, lens 21 return (be INF direction) based on measuring with umber of pulse S to contrary direction from having obtained the peaked position of AF evaluation of estimate again.Then, the mensuration of the AF evaluation of estimate of stipulating once more from the position that lens 21 these times are returned.Therefore, compare, can shorten displacement, the driving scope of reducing glass 21 to returning against direction (being the INF direction) based on measuring again with umber of pulse S with the situation of the starting position that lens 21 is turned back to the focusing action.As a result, can shorten lens 21 and focus on the needed driving time of execution that drives.Particularly, the peaked position that has obtained the AF evaluation of estimate the closer to the starting position of measuring again of AF evaluation of estimate (promptly, P5 is the closer to INF direction side), under the control of mobile control gear 231 and the displacement of the lens 21 that move is short more, so, can further shorten lens 21 and focus on the needed driving time of execution that drives.
In addition, the step S211 of Figure 13 is equivalent to actual number of drive pulses determination step of the present invention, step S211～S213 is equivalent to correction coefficient and calculates step, step S214 is equivalent to AF evaluation of estimate determination step, step S221 is equivalent to aligning step, step S222 is equivalent to mobile controlled step, and step S223 is equivalent to determination step again.Here,, carried out step S211 in driving control device 220 energized and the focusing of carrying out lens 21 behind the power connection at first when driving, but also can after carry out step S212～S214.In addition, because to moment after driving control device 220 energized, measure the deviation that there is brightness in each frame that mechanism 234 measures by the AF evaluation of estimate, so, after this deviation is stable, execution in step S211.
Figure 14 represents the processing action that lens 21 are carried out based on mobile control gear 231 and the chart of relation between the AF evaluation of estimate of the focus of the direction that moves with as the detection focus time.Figure 14 (a) is illustrated in based on the AF evaluation of estimate to measure the chart that has obtained peaked situation in the mensuration of mechanism 234, and Figure 14 (b) is illustrated in the chart that does not have the peaked situation of AF evaluation of estimate in the focusing driving scope of lens 21.Shown in Figure 14 (a), at first, in order to measure the AF evaluation of estimate, lens 21 towards N directions, move with the order process of P3, P4 (S214 of Figure 13) to P2 from P1.Here, used the correction coefficient N of the N direction of in above-mentioned steps S213, calculating.In addition, the focusing driving scope of lens 21 is from P1 to P2.Here, in the moment of lens 21 arrival P5, the AF evaluation of estimate begins to reduce.Therefore, P4 is detected as the peaked position that has obtained the AF evaluation of estimate in the focusing range of lens 21.At this moment, lens 21 stop at the P5 place.Then, in order to focus, lens 21 move to P4.Then, under the situation that has satisfied above-mentioned rated condition, lens 21 move (S222 of Figure 13) towards the INF direction from P4 towards P3.Here, used the correction coefficient M of the INF direction of in above-mentioned steps S213, calculating.P3 is based on measuring (=L * M) and the position after the INF direction is returned with umber of pulse S again from P4.That is, P3 is based on the starting position of mensuration again that the AF evaluation of estimate is measured the AF evaluation of estimate of mechanism 234.Then, in order to measure the AF evaluation of estimate again, lens 21 move to P5 (S223 of Figure 13) from P3 towards P2 via P4.Here, used the correction coefficient M of the N direction of in above-mentioned step S213, calculating.Then, in order to focus once more, lens 21 move to P4.Here, used the correction coefficient M of the INF direction of in above-mentioned step S213, calculating.In addition, also can make in order to focus after lens 21 move to P4, mobile control gear 231 makes lens 21 move to the N direction based on measuring with umber of pulse S again.Under this situation, after this mobile end, by AF evaluation of estimate mensuration mechanism 234 lens 21 to INF direction moved on one side, carry out the mensuration of AF evaluation of estimate on one side.
Here, in the mensuration of each above-mentioned AF evaluation of estimate, shown in Figure 14 (b), when not having the maximal value (P10) of AF evaluation of estimate in the focusing driving scope at lens 21, think the mensuration mistake has taken place, be judged to be the condition among the S21 that does not satisfy Figure 13.
In addition, for example also can comprise driving control device 220 with the portable optical apparatus such as mobile telephone terminal of camera.More specifically, in the portable optical apparatus that comprises camera unit, communication-telephony unit, power supply unit and constitute, this camera unit also can comprise driving control device 220.Under this situation, power supply unit can be controlled power connection, the disconnection of camera unit.Thus, because in such portable optical apparatus, also shortened the needed driving time of execution that the focusing of lens 21 drives, so, the convenience when using that such portable optical apparatus is photographed etc. can be improved.
And, also can for industry personnel be above-mentioned first～the 3rd embodiment of combination in any in the scope of understanding.And, only otherwise damage purport of the present invention, can be in the scope of understanding for industry personnel, each of improvement first～the 3rd embodiment, and their combination.

Claims (8)

1. driving control device is characterized in that possessing:
Along the flexible electricapparatus conversion element of prescribed direction;
Be fixed on the drive member of an end of the described electricapparatus conversion element of described prescribed direction; With
To the driving pulse control part of controlling towards the supply of the driving pulse of described electricapparatus conversion element,
Described driving pulse control part is according to making along the extension speed mode different with contraction speed of the described electricapparatus conversion element of described prescribed direction, control the supply of described driving pulse, make described electricapparatus conversion element flexible, described drive member is vibrated along described prescribed direction, thereby make the member that is driven with this drive member friction apply, to comprising that the both direction along the direction of direction of described prescribed direction and contrary thereof moves
Described driving pulse control part comprises:
Actual number of drive pulses is measured mechanism, it is carrying out before the described location action that is driven the location of member begins, at each direction of described both direction, measure respectively and make the described needed actual number of drive pulses of the actual mobile regulation amount of movement of member that is driven;
Correction coefficient is calculated mechanism, it is at each direction of described both direction, respectively based on actual number of drive pulses that obtains by mensuration and predetermined basic pulse number, calculate and be used for correction coefficient that the relation between number of drive pulses and the described displacement that is driven member is proofreaied and correct; With
The number of drive pulses aligning gear, it is based on the described both direction correction coefficient of being calculated separately, to describedly to be driven that member moves and to proofread and correct to the element drives umber of pulse that described electricapparatus conversion element is supplied with in order to make.
2. driving control device according to claim 1 is characterized in that,
Described driving pulse control part also comprises the correction decision mechanism, described correction decision mechanism based on by described both direction separately actual number of drive pulses and predetermined basic pulse number ask for, with the relevant predetermined coefficients that deviates from of described actual number of drive pulses and described basic pulse number, and specified reference value, judge whether the correction of number of drive pulses that need be corresponding with temperature variation
Described number of drive pulses aligning gear under the situation of the correction that is judged as described number of drive pulses that need be corresponding with temperature variation, is implemented the correction corresponding with predetermined temperature variation to described element drives umber of pulse.
3. driving control device according to claim 1 and 2 is characterized in that,
The described member that is driven comprises lens and constitutes that described prescribed direction is the optical axis direction of described lens.
4. a drive controlling method is characterized in that,
Possessing the electricapparatus conversion element flexible, be fixed in the drive member and driving control device of an end of the described electricapparatus conversion element in the described prescribed direction the driving pulse control part controlled towards the supply of the driving pulse of described electricapparatus conversion element along prescribed direction
By utilizing described driving pulse control part, according to making along the extension speed mode different of the described electricapparatus conversion element of described prescribed direction with contraction speed, the supply of controlling described driving pulse makes described electricapparatus conversion element flexible, described drive member is vibrated along described prescribed direction, thereby make with this drive member friction apply be driven member comprise a described direction along prescribed direction with and the both direction of the direction of contrary on move
Described drive controlling method comprises:
Actual number of drive pulses determination step, wherein said driving pulse control part, to each direction of described both direction, measure and make the described needed actual number of drive pulses of the actual mobile regulation amount of movement of member that is driven before the described location action that is driven member location begins carrying out;
Correction coefficient is calculated step, wherein said driving pulse control part is at each direction of described both direction, based on actual number of drive pulses that obtains by mensuration and predetermined basic pulse number, calculate and be used for correction coefficient that the relation between number of drive pulses and the described displacement that is driven member is proofreaied and correct; With
The number of drive pulses aligning step, wherein said driving pulse control part, based on the correction coefficient separately of the described both direction of being calculated, to describedly being driven that member moves and proofreading and correct to the element drives umber of pulse that described electricapparatus conversion element is supplied with in order to make.
5. drive controlling method according to claim 4 is characterized in that,
Also comprise:
Proofread and correct determining step, wherein said driving pulse control part based on by about described both direction separately actual number of drive pulses and predetermined basic pulse number ask for described actual number of drive pulses and described basic pulse number deviate from relevant predetermined coefficients and specified reference value, judge whether need with the correction of the corresponding number of drive pulses of temperature variation; And
The temperature compensation step, wherein be judged as need with the situation of the correction of the corresponding described number of drive pulses of temperature variation under, described driving pulse control part is implemented and the corresponding correction of predetermined temperature variation described element drives umber of pulse.
6. driving control device, wherein,
Possess:
Along the flexible electricapparatus conversion element of prescribed direction;
Be fixed on the drive member of an end of the described electricapparatus conversion element of described prescribed direction; And
To the driving pulse control part of controlling towards the supply of the driving pulse of described electricapparatus conversion element,
Described driving pulse control part, according to making along the extension speed mode different of the described electricapparatus conversion element of described prescribed direction with contraction speed, control the supply of described driving pulse, make described electricapparatus conversion element flexible, described drive member is vibrated along described prescribed direction, thereby make with this drive member friction apply and comprise lens and the member that is driven that constitutes moves along described prescribed direction
Described driving pulse control part comprises:
Actual number of drive pulses is measured mechanism, it is before the focusing action beginning of described lens, at with this focusing action in the described direction that is driven the driving direction contrary of member, make the described member that is driven move the needed actual number of drive pulses of regulation displacement and measure to actual;
Correction coefficient is calculated mechanism, it is at the direction of described contrary, based on actual number of drive pulses that obtains by mensuration and predetermined basic pulse number, calculate and be used for correction coefficient that the relation between number of drive pulses and the described displacement that is driven member is proofreaied and correct;
The AF evaluation of estimate is measured mechanism, it is for the focusing action of described lens, on one side make this be driven member and move to described driving direction by each regulation number of drive pulses, on one side in each mensuration the AF evaluation of estimate to the regulation that obtains by the image of taking by these lens measure;
Aligning gear, it is based on calculating the correction coefficient that mechanism calculates by described correction coefficient, to with from the peaked position of the AF evaluation of estimate that obtained measuring gained to the starting position of measuring again of measuring mechanism based on described AF evaluation of estimate till displacement corresponding mobile umber of pulse proofread and correct, measured again and used umber of pulse;
Light-measuring mechanism, instrumentation is carried out in its brightness to reference object; With
Mobile control gear, its mensuration success before measuring mechanism based on described AF evaluation of estimate situation under, and when the mensuration success before measuring mechanism under the elapsed time situation at the appointed time of process based on described AF evaluation of estimate, and the variation of the brightness that obtains based on the instrumentation of described light-measuring mechanism when being arranged in the first condition of first specialized range and the success of this mensurations of the variation of the AF evaluation of estimate that obtains when the success of this mensuration is positioned under the situation of the both sides of second condition of second specialized range or side abundance, according to from having obtained peaked position by the AF evaluation of estimate of the mensuration gained of measuring mechanism based on described AF evaluation of estimate, based on the umber of pulse of mensuration again that obtains by the correction of described aligning gear, make the described mode that member returns to the direction of contrary that is driven, control the supply of described driving pulse
Described be driven member based on described mobile control gear after the direction of contrary is returned, described AF evaluation of estimate is measured mechanism, from described this position after being driven this time of member and being returned, carries out the mensuration of the AF evaluation of estimate of described regulation once more.
7. a portable optical apparatus comprises the described driving control device of claim 6.
8. a drive controlling method is characterized in that,
Possessing:
Along the flexible electricapparatus conversion element of prescribed direction;
Be fixed on the drive member of an end of the described electricapparatus conversion element of described prescribed direction; And
In the driving control device to the driving pulse control part controlled towards the supply of the driving pulse of described electricapparatus conversion element,
By utilizing described driving pulse control part, according to making along the extension speed mode different of the described electricapparatus conversion element of described prescribed direction with contraction speed, control the supply of described driving pulse and make described electricapparatus conversion element flexible, described drive member is vibrated along described prescribed direction, thereby make with this drive member friction apply and comprise lens and the member that is driven that constitutes moves along described prescribed direction
Described drive controlling method comprises:
Actual number of drive pulses determination step, wherein before the focusing action beginning of described lens, described driving pulse control part at this focusing action in the described direction that is driven the driving direction contrary of member, make the described member that is driven move the needed actual number of drive pulses of regulation displacement and measure to actual;
Correction coefficient is calculated step, wherein said driving pulse control part is at the direction of described contrary, based on actual number of drive pulses that obtains by mensuration and predetermined basic pulse number, calculate and be used for correction coefficient that the relation between number of drive pulses and the described displacement that is driven member is proofreaied and correct;
AF evaluation of estimate determination step, wherein said driving pulse control part, focusing action for described lens, making this be driven member by each regulation number of drive pulses on one side moves to described driving direction, on one side in this is each, to measuring by the AF evaluation of estimate of the regulation that obtains by means of the image of this lens shooting;
Aligning step, wherein said driving pulse control part is based on calculating the correction coefficient that step is calculated by described correction coefficient, to with from the peaked position of the AF evaluation of estimate that obtained measuring gained to the starting position of measuring again of AF evaluation of estimate till displacement corresponding mobile umber of pulse proofread and correct, used umber of pulse and measure again;
The photometry step, wherein said driving pulse control part carries out instrumentation to the brightness of reference object; And
Mobile controlled step, wherein in the mensuration before described AF evaluation of estimate determination step success situation under, and under the elapsed time situation at the appointed time of when success process of the mensuration before described AF evaluation of estimate determination step, and the brightness that is obtained by the instrumentation in the described photometry step when first condition of variation in first specialized range of the AF evaluation of estimate that obtains when the success of this mensuration and the success of this mensurations changes under the situation of both sides in the second condition of second specialized range or side abundance, described driving pulse control part, according to from having obtained peaked position by the AF evaluation of estimate of the mensuration gained the described AF evaluation of estimate determination step, based on the umber of pulse of mensuration again that obtains by described aligning step, make the described mode that member returns to the direction of contrary that is driven, control the supply of described driving pulse; With
Determination step again, wherein said driving pulse control part described be driven member by described mobile controlled step after the direction of contrary is returned, from described this position after being driven member and returning, carry out the mensuration of the AF evaluation of estimate of described regulation once more.
CN2006101493196A 2005-11-21 2006-11-20 Driving control device, portable optical apparatus and driving control method Expired - Fee Related CN1980036B (en)

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