CN102271277A - Method and device for correcting error of motor in video camera - Google Patents
Method and device for correcting error of motor in video camera Download PDFInfo
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Abstract
The invention relates to the video camera field, and discloses a method and device for correcting the error of a motor in a video camera. In the method and device provided by the invention, zooming-focusing is conducted after primary position initialization of the stepping motor until the times of the zooming-focusing action is counted up to a preset number; and then the stepping motor which controls zooming-focusing begins another time to find automatically the position indicated by a position detector for secondary position initialization. Thus the camera lens is reset automatically. By adopting the method and device provided by the invention, run focal caused by the cumulative error of the stepping motor can be avoided so that the total imaging error of the video camera is reduced and the imaging definition is improved.
Description
Technical field
The present invention relates to field of cameras, in particular a kind of video camera motor error correcting method and device.
Background technology
The change of video camera is doubly generally adopted stepper motor with the motor that focuses on.When camera lens powers on, drive stepper motor to corresponding position detector, promptly finished the position initialization of stepper motor.Change afterwards is doubly and when focusing on, and the distance and position that the corresponding eyeglass group of the drive of stepper motor moves is on the basis of initial position, and the umber of pulse of giving stepper motor obtains by calculating.
The video camera of prior art is after becoming the zoom and focus action for a long time, because a variety of causes, such as foreign matter is arranged on the motor drive shaft, the distance that the reality of the stepper motor that becomes doubly and focus on moves can be offset with the distance that calculates, usually said losing the step that Here it is, and it is unclear to cause video camera to focus on, and promptly runs burnt.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The technical problem to be solved in the present invention is, above-mentioned defective at prior art, a kind of video camera motor error correcting method and device are provided, reset by the automatic camera lens of video camera, the cumulative errors that can solve owing to stepper motor cause the burnt problem of running.
The technical scheme that technical solution problem of the present invention is adopted is as follows:
A kind of video camera motor error correcting method wherein, comprising:
The start of A, video camera, drive be used to control become doubly and the stepper motor that focuses on to the corresponding position of position detector, carry out the position initialization first time with the control step motor;
B, control become doubly and the stepper motor that focuses on drives camera lens and becomes accordingly doubly and focus on action, and statistics becomes doubly and focuses on the number of times that moves;
C, the change that will add up doubly and the number of times and the predetermined times value that focus on action compare judgement, when the statistics change doubly equals this predetermined times value with the number of times that focuses on action, drive described stepper motor once more to corresponding position detector, carry out the position initialization second time with the control step motor, and return step B.
Described video camera motor error correcting method, wherein, the described stepper motor of driving once more among the described step C is to corresponding position detector, carries out second time position initialization with the control step motor and specifically comprises:
C1, for the first time read the level signal of position detector, enter step C2;
C2, this level signal that reads is for the first time compared judgement, when judging this level signal that reads for the first time, enter step C3, when judging this level signal that reads for the first time, enter step C6 for low level signal for high level signal;
C3, control step motor turn round to clockwise direction, and change step C4 over to;
C4, carry out reading for the second time the level signal of position detector, enter step C5;
C5, this level signal that reads is for the second time compared judgement, when judging this level signal that reads for the second time, turn back to step C3, when judging this level signal that reads for the second time, enter step C6 for low level signal for high level signal;
C6, control step motor are to running counterclockwise.
Described video camera motor error correcting method wherein, also comprises after the described step C6:
C7, read the level signal of position detector for the third time, and enter step C8;
C8, this level signal that reads is for the third time compared judgement, when judging this level signal that reads for the third time, turn back to step C6 for low level signal; When judging that this level signal that reads for the third time is high level signal, enter step C9,
C9, initialization are finished.
Described video camera motor error correcting method, wherein, described position detector adopts optical chopper.
A kind of video camera motor error correction device wherein, comprising:
First initialization module is used for when video camera is started shooting, drive be used to control become doubly and the stepper motor that focuses on to the corresponding position of position detector, carry out the position initialization first time with the control step motor;
Change doubly reaches the focus control module, is used to control become doubly to become accordingly doubly and focus on the stepper motor driving camera lens that focuses on move;
Statistical module is used to add up the number of times that becomes doubly and focus on action;
Judge module is used for the change of statistics is doubly compared judgement with the number of times and the predetermined times value that focus on action;
Second initialization module is used for driving described stepper motor once more and arriving corresponding position detector when the statistics change doubly equals this predetermined times value with the number of times that focuses on action, carries out the position initialization second time with the control step motor.
Described video camera motor error correction device, wherein, described second initialization module further comprises:
First reading unit is used for reading for the first time the level signal of position detector;
First identifying unit is used for this level signal that reads is for the first time compared judgement;
Second reading unit is used for reading for the second time the level signal of position detector;
Second identifying unit is used for this level signal that reads is for the second time compared judgement.
Described video camera motor error correction device, wherein, described second initialization module also comprises:
First control unit is used on the one hand when judging that the level signal that reads for the first time is high level signal, and control step motor CW is used for when judging that the level signal that reads for the second time is high level signal control step motor CW on the other hand;
Second control unit is used on the one hand when judging that the level signal that reads for the first time is low level signal, and control step motor CCW is used for when judging that the level signal that reads for the second time is low level signal control step motor CCW on the other hand.
Described video camera motor error correction device, wherein, described second initialization module also comprises:
Third reading is got the unit, is used for reading for the third time the level signal of position detector;
The 3rd identifying unit is used for the level signal that reads is for the third time compared judgement;
Described second control unit also is used for when judging that the level signal that reads for the third time is low level signal, control step motor CW;
End unit is used for finishing initialization when judging that this level signal that reads for the third time is high level signal.
Described video camera motor error correction device, wherein, described position detector adopts optical chopper.
Described video camera motor error correction device, wherein, described optical chopper comprises a light-emitting diode and a sensitization triode, and the anti-dazzling screen of an activity is set between described light-emitting diode and sensitization triode;
One end of described light-emitting diode is connected with the collector electrode of described sensitization triode, and is connected to working power; The other end of described light-emitting diode connects with reference to ground by first resistance;
The emitter of described sensitization triode is connected to a level signal output, and the emitter of described sensitization triode also is connected to reference to ground by one second resistance.
Video camera motor error correcting method provided by the present invention and device, owing to adopted statistics to become doubly and the number of times that focuses on, arrive (user can set this numerical value by menu) after the predetermined times, become doubly and once seek position detector (adopting infrared energy-conserving type optical chopper (being commonly called as PI)) position more automatically with the stepper motor that focuses on, carry out the initialization second time, reset by the automatic camera lens of video camera, the cumulative errors that can solve owing to stepper motor cause the burnt problem of running, make the error integral body of video camera imaging reduce, thereby improved the video camera imaging definition.
Description of drawings
Fig. 1 is the video camera motor error correcting method flow chart of the embodiment of the invention.
Fig. 2 is the position transducer operation principle circuit diagram of the embodiment of the invention.
Fig. 3 is camera lens second initialization flowchart of the embodiment of the invention.
Fig. 4 is the video camera motor error correction principle of device block diagram of the embodiment of the invention.
Fig. 5 is the inner theory diagram of second initialization module of the video camera motor error correction device of the embodiment of the invention.
Embodiment
Video camera motor error correcting method provided by the present invention and device, clearer, clear and definite for making purpose of the present invention, technical scheme and advantage, below develop simultaneously with reference to accompanying drawing that the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
A kind of video camera motor error correcting method that the embodiment of the invention provides as shown in Figure 1, mainly may further comprise the steps:
The start that powers on of step S100, video camera, at first drive be used to control become doubly and the stepper motor that focuses on to corresponding position detector position, carry out the position initialization first time with the control step motor; Promptly finish the camera lens initialization of video camera start.
Step S200, control become doubly and the stepper motor that focuses on drives camera lens and becomes accordingly doubly and focus on action, and statistics becomes doubly and focuses on the number of times that moves;
Wherein, accepting at video camera that the zoom sign on promptly calculates till the zoom END instruction is a zoom.In like manner, but scene focus on when changing and begin to finish to calculate a zoom to focusing on.Statistic processes is exactly with these number of times additions.
Step S300, the change that will add up doubly and the number of times and the predetermined times value that focus on action compare judgement, when the statistics change doubly equals this predetermined times value with the number of times that focuses on action, drive described stepper motor once more to corresponding position detector, carry out the position initialization second time with the control step motor, and return step S200, finish up to shutdown.
Such as can close or open this statistical function by the operation that receives the user in menu, the operating and setting that can receive the user requires video camera to automatically reset after change doubly reaches focusing action arrival how many times.
Wherein, the operation principle of position transducer of the present invention as shown in Figure 2, position detector described in the present embodiment adopts infrared energy-conserving type optical chopper (being commonly called as PI), described optical chopper 400 comprises a light-emitting diode 401 and a sensitization triode 402, and the anti-dazzling screen 403 of an activity is set between described light-emitting diode 401 and sensitization triode 402;
One end of described light-emitting diode 401 is connected with the collector electrode of described sensitization triode 403, and is connected to working power VCC; The other end of described light-emitting diode 401 connects with reference to ground by first resistance R 1.
The emitter of described sensitization triode 402 is connected to a level signal output end vo ut, and the emitter of described sensitization triode 402 also is connected to reference to ground by one second resistance R 2.
When anti-dazzling screen did not block between light-emitting diode and the sensitization triode, level signal output end vo ut exported high level, shown in the figure of Fig. 2 left side; When the anti-dazzling screen retaining was between them, level signal output end vo ut output low level was shown in the figure of Fig. 2 the right.
Based on the operation principle of the invention described above position transducer, as shown in Figure 3, the described stepper motor of driving once more among the described step S300 of the embodiment of the invention is to corresponding position detector, carries out second time position initialization with the control step motor and specifically comprises:
C1, for the second time position initialization begins, and at first carries out reading for the first time the level signal of position detector Vout end, referring to Fig. 2, and enters step C2;
C2, this level signal that reads is for the first time compared judgement (promptly carry out first level judge), when judging that this level signal that reads for the first time enters step C3 when being high level signal (as 1), when judging that this level signal that reads for the first time enters step C6 when being low level signal (as 0);
C3, control step motor turn round to clockwise direction, i.e. the clockwise direction running seen from the axle head of exerting oneself of control step motor (is called for short: control step motor CW), and change step C4 over to;
C4, carry out reading for the second time the level signal of position detector Vout end, and enter step C5;
C5, this level signal that reads is for the second time compared judgement (i.e. second level judge), when judging this level signal that reads for the second time, turn back to step C3, when judging this level signal that reads for the second time, enter step C6 for low level signal for high level signal;
C6, control step motor are to running counterclockwise, and promptly the control step motor sees that from the axle head of exerting oneself counterclockwise running (is called for short: control step motor CCW).
C7, read the level signal of position detector Vout end for the third time, and enter step C8;
C8, this level signal that reads is for the third time compared judgement, when judging this level signal that reads for the third time, turn back to step C6 for low level signal; When judging that this level signal that reads for the third time is high level signal, enter step C9,
C9, for the second time position initialization is finished, and promptly controls lens resets once more and finishes.
For example, can establish the variable that becomes doubly and focus on action frequency and be dwZMtime, automatically reset finish after, dwZMtime=0.Have at video camera and to become when doubly finishing dwZMtime=dwZMtime+1.When dwZMtime arrived the number of times of user's setting, the inventive method just started the above-mentioned flow process that automatically resets camera lens is resetted.
Therefore, the video camera motor error correcting method of the embodiment of the invention, owing to adopted statistics to become doubly and the number of times that focuses on, arrive (user can set this numerical value by menu) after the predetermined times, become doubly and once seek the position detector position more automatically with the stepper motor that focuses on, controls lens is carried out the initialization second time, reset by the automatic camera lens of video camera, the cumulative errors that can solve owing to stepper motor cause the burnt problem of running, make the error integral body of video camera imaging reduce, thereby improved the video camera imaging definition.
Based on the video camera motor error correcting method of the foregoing description, the embodiment of the invention also provides a kind of video camera motor error correction device, as shown in Figure 4, comprising:
Change doubly reaches focus control module 520, is used to control become doubly to become accordingly doubly and focus on the stepper motor driving camera lens that focuses on move;
As shown in Figure 5, described second initialization module 550 further comprises:
First identifying unit 552 is used for this level signal that reads is for the first time compared judgement;
Second identifying unit 554 is used for this level signal that reads is for the second time compared judgement.
Second control unit 556 is used on the one hand when judging that the level signal that reads for the first time is low level signal, and control step motor CCW is used for when judging that the level signal that reads for the second time is low level signal control step motor CCW on the other hand.
Third reading is got unit 557, is used to read for the third time the level signal of position detector;
The 3rd identifying unit 558 is used for the level signal that reads is for the third time compared judgement;
Described second control unit 556 also is used for when judging that the level signal that reads for the third time is low level signal, control step motor CW;
Further, described position detector adopts optical chopper.Wherein, the operation principle of position transducer of the present invention as shown in Figure 2, position detector described in the present embodiment adopts infrared energy-conserving type optical chopper (being commonly called as PI), described optical chopper 400 comprises a light-emitting diode 401 and a sensitization triode 402, and the anti-dazzling screen 403 of an activity is set between described light-emitting diode 401 and sensitization triode 402;
One end of described light-emitting diode 401 is connected with the collector electrode of described sensitization triode 403, and is connected to working power VCC; The other end of described light-emitting diode 401 connects with reference to ground by first resistance R 1.
The emitter of described sensitization triode 402 is connected to a level signal output end vo ut, and the emitter of described sensitization triode 402 also is connected to reference to ground by one second resistance R 2.
When anti-dazzling screen did not block between light-emitting diode and the sensitization triode, level signal output end vo ut exported high level, shown in the figure of Fig. 2 left side; When the anti-dazzling screen retaining was between them, level signal output end vo ut output low level was shown in the figure of Fig. 2 the right.
Video camera motor error correcting method provided by the present invention and device, owing to adopted statistics to become doubly and the number of times that focuses on, arrive (user can set this numerical value by menu) after the predetermined times, become doubly and once seek position detector (adopting infrared energy-conserving type optical chopper (being commonly called as PI)) position more automatically with the stepper motor that focuses on, carry out the initialization second time, reset by the automatic camera lens of video camera, the cumulative errors that can solve owing to stepper motor cause the burnt problem of running, make the error integral body of video camera imaging reduce, thereby improved the video camera imaging definition.
Should be understood that application of the present invention is not limited to above-mentioned giving an example, for those of ordinary skills, can be improved according to the above description or conversion that all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (10)
1. a video camera motor error correcting method is characterized in that, comprising:
The start of A, video camera, drive be used to control become doubly and the stepper motor that focuses on to the corresponding position of position detector, carry out the position initialization first time with the control step motor;
B, control become doubly and the stepper motor that focuses on drives camera lens and becomes accordingly doubly and focus on action, and statistics becomes doubly and focuses on the number of times that moves;
C, the change that will add up doubly and the number of times and the predetermined times value that focus on action compare judgement, when the statistics change doubly equals this predetermined times value with the number of times that focuses on action, drive described stepper motor once more to corresponding position detector, carry out the position initialization second time with the control step motor, and return step B.
2. video camera motor error correcting method according to claim 1 is characterized in that, the described stepper motor of driving once more among the described step C is to corresponding position detector, carries out second time position initialization with the control step motor and specifically comprises:
C1, for the first time read the level signal of position detector, enter step C2;
C2, this level signal that reads is for the first time compared judgement, when judging this level signal that reads for the first time, enter step C3, when judging this level signal that reads for the first time, enter step C6 for low level signal for high level signal;
C3, control step motor turn round to clockwise direction, and change step C4 over to;
C4, carry out reading for the second time the level signal of position detector, enter step C5;
C5, this level signal that reads is for the second time compared judgement, when judging this level signal that reads for the second time, turn back to step C3, when judging this level signal that reads for the second time, enter step C6 for low level signal for high level signal;
C6, control step motor are to running counterclockwise.
3. video camera motor error correcting method according to claim 2 is characterized in that, also comprises after the described step C6:
C7, read the level signal of position detector for the third time, and enter step C8;
C8, this level signal that reads is for the third time compared judgement, when judging this level signal that reads for the third time, turn back to step C6 for low level signal; When judging that this level signal that reads for the third time is high level signal, enter step C9,
C9, initialization are finished.
4. video camera motor error correcting method according to claim 1 is characterized in that, described position detector adopts optical chopper.
5. a video camera motor error correction device is characterized in that, comprising:
First initialization module is used for when video camera is started shooting, drive be used to control become doubly and the stepper motor that focuses on to the corresponding position of position detector, carry out the position initialization first time with the control step motor;
Change doubly reaches the focus control module, is used to control become doubly to become accordingly doubly and focus on the stepper motor driving camera lens that focuses on move;
Statistical module is used to add up the number of times that becomes doubly and focus on action;
Judge module is used for the change of statistics is doubly compared judgement with the number of times and the predetermined times value that focus on action;
Second initialization module is used for driving described stepper motor once more and arriving corresponding position detector when the statistics change doubly equals this predetermined times value with the number of times that focuses on action, carries out the position initialization second time with the control step motor.
6. according to the described video camera motor of claim 5 error correction device, it is characterized in that described second initialization module further comprises:
First reading unit is used for reading for the first time the level signal of position detector;
First identifying unit is used for this level signal that reads is for the first time compared judgement;
Second reading unit is used for reading for the second time the level signal of position detector;
Second identifying unit is used for this level signal that reads is for the second time compared judgement.
7. according to the described video camera motor of claim 6 error correction device, it is characterized in that described second initialization module also comprises:
First control unit is used on the one hand when judging that the level signal that reads for the first time is high level signal, and control step motor CW is used for when judging that the level signal that reads for the second time is high level signal control step motor CW on the other hand;
Second control unit is used on the one hand when judging that the level signal that reads for the first time is low level signal, and control step motor CCW is used for when judging that the level signal that reads for the second time is low level signal control step motor CCW on the other hand.
8. according to the described video camera motor of claim 7 error correction device, it is characterized in that described second initialization module also comprises:
Third reading is got the unit, is used for reading for the third time the level signal of position detector;
The 3rd identifying unit is used for the level signal that reads is for the third time compared judgement;
Described second control unit also is used for when judging that the level signal that reads for the third time is low level signal, control step motor CW;
End unit is used for finishing initialization when judging that this level signal that reads for the third time is high level signal.
9. according to the described video camera motor of claim 5 error correction device, it is characterized in that described position detector adopts optical chopper.
10. according to the described video camera motor of claim 9 error correction device, it is characterized in that described optical chopper comprises a light-emitting diode and a sensitization triode, and the anti-dazzling screen of an activity is set between described light-emitting diode and sensitization triode;
One end of described light-emitting diode is connected with the collector electrode of described sensitization triode, and is connected to working power; The other end of described light-emitting diode connects with reference to ground by first resistance;
The emitter of described sensitization triode is connected to a level signal output, and the emitter of described sensitization triode also is connected to reference to ground by one second resistance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110009281A CN102271277B (en) | 2011-01-17 | 2011-01-17 | Method and device for correcting error of motor in video camera |
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| CN201110009281A CN102271277B (en) | 2011-01-17 | 2011-01-17 | Method and device for correcting error of motor in video camera |
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| CN102271277A true CN102271277A (en) | 2011-12-07 |
| CN102271277B CN102271277B (en) | 2012-07-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104977784A (en) * | 2012-01-18 | 2015-10-14 | 佳能株式会社 | Interchangeable lens and camera system |
| CN105487196A (en) * | 2016-01-29 | 2016-04-13 | 福建福光股份有限公司 | Drive control box for production line to check phase of zoom lens and control method thereof |
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| CN1168178A (en) * | 1995-10-04 | 1997-12-17 | 三星航空产业株式会社 | System and method for driving electronic shutter of camera |
| JPH11183777A (en) * | 1997-12-22 | 1999-07-09 | Canon Inc | Camera apparatus and its preset control method |
| CN1710936A (en) * | 2004-06-17 | 2005-12-21 | 株式会社日立制作所 | Imaging apparatus |
| CN101078857A (en) * | 2006-05-23 | 2007-11-28 | 普立尔科技股份有限公司 | Real-time automatic focusing method |
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| CN1168178A (en) * | 1995-10-04 | 1997-12-17 | 三星航空产业株式会社 | System and method for driving electronic shutter of camera |
| JPH11183777A (en) * | 1997-12-22 | 1999-07-09 | Canon Inc | Camera apparatus and its preset control method |
| CN1710936A (en) * | 2004-06-17 | 2005-12-21 | 株式会社日立制作所 | Imaging apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104977784A (en) * | 2012-01-18 | 2015-10-14 | 佳能株式会社 | Interchangeable lens and camera system |
| CN104977784B (en) * | 2012-01-18 | 2018-09-04 | 佳能株式会社 | Replaceable camera lens and camera arrangement |
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| CN102271277B (en) | 2012-07-04 |
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