CN102271277B - 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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- CN102271277B CN102271277B CN201110009281A CN201110009281A CN102271277B CN 102271277 B CN102271277 B CN 102271277B CN 201110009281 A CN201110009281 A CN 201110009281A CN 201110009281 A CN201110009281 A CN 201110009281A CN 102271277 B CN102271277 B CN 102271277B
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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 accomplished the position initialization of stepper motor.Doubly when focusing on, the distance and position that the corresponding eyeglass crowd of the drive of stepper motor moves is on the basis of initial position in change afterwards, and the umber of pulse of giving stepper motor obtains through 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, become doubly the distance that the reality with the stepper motor that focuses on moves and to squint usually said losing the step that Here it is with the distance that calculates; And it is unclear to cause video camera to focus on, and promptly runs burnt.
Therefore, prior art awaits to improve and development.
Summary of the invention
The technical problem that the present invention will solve is; Above-mentioned defective to prior art; A kind of video camera motor error correcting method and device are provided, reset through 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 following:
A kind of video camera motor error correcting method wherein, comprising:
The start of A, video camera, drive be used to control become doubly with the stepper motor that focuses on to the position the corresponding position of detector, carry out the position initialization first time with the control step motor;
B, control become doubly and the step motor driven camera lens that focuses on becomes doubly accordingly 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 said stepper motor once more to corresponding position detector; Carry out the position initialization second time with the control step motor, and return step B; Specifically comprise:
C1, for the first time read the level signal of position detector, get into 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, get into step C3, when judging this level signal that reads for the first time, get into 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, get into 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, get into 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 said step C6:
C7, read the level signal of position detector for the third time, and get into 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, get into step C9,
C9, initialization are accomplished.
Described video camera motor error correcting method, wherein, said 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 with the stepper motor that focuses on to the position the corresponding position of detector, carry out the position initialization first time with the control step motor;
Become doubly and the focus control module, be used to control become doubly to become accordingly doubly and focus on and move with the step motor driven camera lens that focuses on;
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 when the statistics change doubly equals this predetermined times value with the number of times that focuses on action, driving said stepper motor once more and arriving corresponding position detector, carries out the position initialization second time with the control step motor; Said 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;
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.
Said video camera motor error correction device, wherein, said 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;
Said 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 when judging that this level signal that reads for the third time is high level signal, finishing initialization.
Said video camera motor error correction device, wherein, said position detector adopts optical chopper.
Said video camera motor error correction device, wherein, said optical chopper comprises a light-emitting diode and a sensitization triode, and the anti-dazzling screen of an activity is set between said light-emitting diode and sensitization triode;
One end of said light-emitting diode is connected with the collector electrode of said sensitization triode, and is connected to working power; The other end of said light-emitting diode connects with reference to ground through first resistance;
The emitter of said sensitization triode is connected to a level signal output, and the emitter of said sensitization triode also is connected to reference to ground through 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; After arriving a predetermined times (user can set this numerical value through menu), become doubly and once seek position detector (adopting infrared energy-conserving type optical chopper (being commonly called as PI)) position more automatically, carry out the initialization second time with the stepper motor that focuses on; Reset through the automatic camera lens of video camera; The cumulative errors that can solve owing to stepper motor cause the problem of running Jiao, make the error integral body of video camera imaging reduce, thereby have 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 the object of the invention, technical scheme and advantage, below develop simultaneously embodiment to further explain of the present invention with reference to accompanying drawing.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 with the stepper motor that focuses on to corresponding position detector position, carry out the position initialization first time with the control step motor; Promptly accomplish the camera lens initialization of video camera start.
Step S200, control become doubly and the step motor driven camera lens that focuses on becomes doubly accordingly 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 said 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 through 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 is as shown in Figure 2; Position detector described in the present embodiment adopts infrared energy-conserving type optical chopper (being commonly called as PI); Said 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 said light-emitting diode 401 and sensitization triode 402;
One end of said light-emitting diode 401 is connected with the collector electrode of said sensitization triode 403, and is connected to working power VCC; The other end of said light-emitting diode 401 connects with reference to ground through first resistance R 1.
The emitter of said sensitization triode 402 is connected to a level signal output end vo ut, and the emitter of said sensitization triode 402 also is connected to reference to ground through 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 said stepper motor of driving once more among the said 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 gets into 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 is high level signal (as 1), get into step C3, when judging that this level signal that reads for the first time is low level signal (as 0), get into step C6;
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 get into 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, get into 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 get into 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, get into step C9, C9, position initialization is accomplished for the second time, i.e. the controls lens completion that resets once more.
For example, can establish the variable that becomes doubly and focus on action frequency and be dwZMtime, automatically reset accomplish 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, arrives (user can set this numerical value through 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, resets through the automatic camera lens of video camera, and 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, and is as shown in Figure 4, comprising:
First initialization module 510 is used for when video camera is started shooting, and driving is used to control become doubly arrives corresponding position detector position with the stepper motor that focuses on, and carries out the position initialization first time with the control step motor;
Become doubly and focus control module 520, be used to control become doubly to become accordingly doubly and focus on and move with the step motor driven camera lens that focuses on;
Statistical module 530 is used for and adds up becoming doubly and the number of times that focuses on action;
Judge module 540 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;
As shown in Figure 5, said 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.
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;
Said 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, said position detector adopts optical chopper.Wherein, The operation principle of position transducer of the present invention is as shown in Figure 2; Position detector described in the present embodiment adopts infrared energy-conserving type optical chopper (being commonly called as PI); Said 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 said light-emitting diode 401 and sensitization triode 402;
One end of said light-emitting diode 401 is connected with the collector electrode of said sensitization triode 403, and is connected to working power VCC; The other end of said light-emitting diode 401 connects with reference to ground through first resistance R 1.
The emitter of said sensitization triode 402 is connected to a level signal output end vo ut, and the emitter of said sensitization triode 402 also is connected to reference to ground through 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; After arriving a predetermined times (user can set this numerical value through menu), become doubly and once seek position detector (adopting infrared energy-conserving type optical chopper (being commonly called as PI)) position more automatically, carry out the initialization second time with the stepper motor that focuses on; Reset through the automatic camera lens of video camera; The cumulative errors that can solve owing to stepper motor cause the problem of running Jiao, make the error integral body of video camera imaging reduce, thereby have improved the video camera imaging definition.
Should be understood that application of the present invention is not limited to above-mentioned giving an example, concerning those of ordinary skills, can improve or conversion that all these improvement and conversion all should belong to the protection range of accompanying claims of the present invention according to above-mentioned explanation.
Claims (7)
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 with the stepper motor that focuses on to the position the corresponding position of detector, carry out the position initialization first time with the control step motor;
B, control become doubly and the step motor driven camera lens that focuses on becomes doubly accordingly 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 said stepper motor once more to corresponding position detector; Carry out the position initialization second time with the control step motor, and return step B; Specifically comprise:
C1, for the first time read the level signal of position detector, get into 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, get into step C3, when judging this level signal that reads for the first time, get into 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, get into 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, get into step C6 for low level signal for high level signal;
C6, control step motor are to running counterclockwise.
2. video camera motor error correcting method according to claim 1 is characterized in that, also comprises after the said step C6:
C7, read the level signal of position detector for the third time, and get into 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, get into step C9,
C9, initialization are accomplished.
3. video camera motor error correcting method according to claim 1 is characterized in that, said position detector adopts optical chopper.
4. 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 with the stepper motor that focuses on to the position the corresponding position of detector, carry out the position initialization first time with the control step motor;
Become doubly and the focus control module, be used to control become doubly to become accordingly doubly and focus on and move with the step motor driven camera lens that focuses on;
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 when the statistics change doubly equals this predetermined times value with the number of times that focuses on action, driving said stepper motor once more and arriving corresponding position detector, carries out the position initialization second time with the control step motor; Said 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;
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.
5. according to the said video camera motor of claim 4 error correction device, it is characterized in that said 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;
Said 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 when judging that this level signal that reads for the third time is high level signal, finishing initialization.
6. according to the said video camera motor of claim 4 error correction device, it is characterized in that said position detector adopts optical chopper.
7. according to the said video camera motor of claim 6 error correction device, it is characterized in that said optical chopper comprises a light-emitting diode and a sensitization triode, and the anti-dazzling screen of an activity is set between said light-emitting diode and sensitization triode;
One end of said light-emitting diode is connected with the collector electrode of said sensitization triode, and is connected to working power; The other end of said light-emitting diode connects with reference to ground through first resistance;
The emitter of said sensitization triode is connected to a level signal output, and the emitter of said sensitization triode also is connected to reference to ground through one second resistance.
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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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| JP5693477B2 (en) * | 2012-01-18 | 2015-04-01 | キヤノン株式会社 | 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11183777A (en) * | 1997-12-22 | 1999-07-09 | Canon Inc | Camera apparatus and its preset control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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