Source: http://www.google.com/patents/US6263162?ie=ISO-8859-1&dq=5920316
Timestamp: 2014-03-11 02:54:55
Document Index: 536008343

Matched Legal Cases: ['art 31', 'art 31', 'art 31', 'art 51', 'art 51', 'art 31', 'art 31', 'art 131', 'art 131', 'art 131', 'art 131', 'art 131', 'art 131', 'art 131', 'art 131', 'art 131']

Patent US6263162 - Image-shake preventing apparatus - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsIn an apparatus such as an image-shake preventing apparatus and a control method therefor, an image-shake preventing unit is caused to gradually come into contact with a movable-range end when an image-shake preventing operation is ended....http://www.google.com/patents/US6263162?utm_source=gb-gplus-sharePatent US6263162 - Image-shake preventing apparatusAdvanced Patent SearchPublication numberUS6263162 B1Publication typeGrantApplication numberUS 09/378,056Publication dateJul 17, 2001Filing dateAug 20, 1999Priority dateAug 25, 1998Fee statusPaidPublication number09378056, 378056, US 6263162 B1, US 6263162B1, US-B1-6263162, US6263162 B1, US6263162B1InventorsTatsuya Yamazaki, Yoshikazu IshikawaOriginal AssigneeCanon Kabushiki KaishaExport CitationBiBTeX, EndNote, RefManPatent Citations (2), Referenced by (30), Classifications (6), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetImage-shake preventing apparatusUS 6263162 B1Abstract In an apparatus such as an image-shake preventing apparatus and a control method therefor, an image-shake preventing unit is caused to gradually come into contact with a movable-range end when an image-shake preventing operation is ended.
FIG. 18 is a conceptual diagram schematically showing the above-mentioned image pickup optical system, which is denoted by reference numeral 200. In the image pickup optical system 200, there are disposed, in order, a fixed lens 201 securely fixed to a lens barrel (not shown), a variator lens 202 arranged to move in the horizontal direction on an optical axis �c� as indicated by an arrow �a�, a shift lens 203 arranged to move two-dimensionally within a plane perpendicular to the optical axis �c� (in the direction indicated by an arrow �b�, a focusing lens 204 having the focus adjusting function and the function of correcting the movement of a focal plane resulting from the movement of the variator lens 202, and an image sensor 205 on which to form an object image. Further, in the respective predetermined positions adjacent to the shift lens 203, there are disposed an actuator 206 arranged to drive the shift lens 203 and a position detecting sensor 207 arranged to detect the position of the shift lens 203.
In the image pickup apparatus 200, even if, as shown in FIG. 19(a), the optical axis �c� deviates from a central axis �c′� of the image pickup optical system 200 due to the vibration thereof as much as a deviation angle e, it is possible to make the optical axis �c� and the central axis �c′� of the image pickup optical system 200 geometrically coincident with each other on the downstream side of the shift lens 203, by driving the actuator 206 to move the shift lens 203 as indicated by an imaginary line in FIG. 19(b). Accordingly, the above-mentioned deviation angle θ is corrected by an optical processing, so that the object image is formed on the image sensor 205 as a light flux having no shaking.
More specifically, the voice coil motor is disposed in a predetermined position adjacent to the shift lens 203. By causing current to flow to the voice coil motor to generate an electromagnetic force, the shift lens 203 is made to float, and by varying the electromagnetic force according to an output of the adder 218, the shift lens 203 is made to two-dimensionally move within a plane perpendicular to the optical axis �c� in the vertical direction (in the pitching direction) and in the horizontal direction (in the yawing direction).
Further, since the optical axis �c� decenters due to the movement of the shift lens 203, for example, if the power supply is turned off during the process of an image pickup operation of the image pickup apparatus, there is a possibility that a video image having an unnatural motion is outputted or recorded on the recording medium.
BRIEF SUMMARY OF THE INVENTION In accordance with one aspect of the invention, there are provided an apparatus such as an image-shake preventing apparatus and a control method therefor, in which an image-shake preventing unit is caused to gradually come into contact with a movable-range end when an image-shake preventing operation is ended, so that it is possible to prevent the image-shake preventing unit from colliding with the movable-range end to generate a collision sound when the image-shake preventing operation is ended.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING FIG. 1 is a schematic diagram showing the arrangement of an image pickup optical system mounted on an image pickup apparatus according to each embodiment of the invention.
Further, on the outer circumferential portion of the lens holding frame 13, there are formed three holes 15 a, 15 b and 15 c at intervals of 120� around the optical axis 4. Guide pins 16 a, 16 b and 16 c of approximately columnar shape are press-fitted or bonded into the holes 15 a, 15 b and 15 c, respectively, whereby the guide pins 16 a, 16 b and 16 c are held integrally with the lens holding frame 13.
Further, the driving amount control part 31 includes, as shown in FIG. 4, A/D converters 42 p and 42 y arranged to convert the analog vibration signals outputted from the vibration signal forming circuit 30 into digital vibration signals, HPFs 43 p and 43 y arranged to remove predetermined low-frequency components from the output signals of the A/D converters 42 p and 42 y, phase/gain correcting circuits 44 p and 44 y arranged to correct the phase and/or gain of the output signals of the HPFs 43 p and 43 y, integration circuits 45 p and 43 y arranged to integrate the output signals of the phase/gain correcting circuits 44 p and 44 y to form correction target values for correcting the image shake, a predetermined-value output circuit 46 arranged to output a lens-movement target value (a predetermined value A) which is desired irrespective of the vibration signals from the vibration signal forming circuit 30, and a change-over switch 47 arranged to change over the output signals of the integration circuits 45 p and 45 y and the output signal of the predetermined-value output circuit 46. The contact �a� of the change-over switch 47 is connected to the integration circuits 45 p and 45 y, the contact �b� of the change-over switch 47 is connected to the predetermined-value output circuit 46, and the contact �c� of the change-over switch 47 is connected to the mode microcomputer 32. Then, the contact �c� of the change-over switch 47 is connected to the contact �a� or the contact �b� depending on the signal from the mode microcomputer 32, which watches the state of the power supply switch 33, so that the correction target values from the integration circuits 45 p and 45 y or the predetermined value A from the predetermined-value output circuit 46 is outputted from the change-over switch 47.
Referring to FIG. 5, in step S1, the whole system is initialized. By this initializing process, first and second flags F1 and F2, which will be described later, are cleared to �0�.
In the next step S2, correction target values used during the image pickup operation are calculated by subjecting the vibration signals formed by the vibration signal forming circuit 30 to the predetermined filtering process at the HPFs 43 p and 43 y, to the phase and gain correction at the phase/gain correcting circuits 44 p and 44 y, and to the integration process at the integration circuits 45 p and 45 y. Subsequently, in step S3, a check is made to find if the first flag F1 is set at �1�. In the first cycle of loop, since the first flag F1 has been cleared to �0� in step S1, the answer in step S3 is negative (No), so that the flow proceeds to step S4. In step S4, the correction target values are outputted to drive the shift lens 7 so as to perform the correction of image shake during the image pickup operation.
In step S7, a check is made through the communication with the mode microcomputer 32 to find if the request for turning-off of the power supply has been received. Incidentally, the presence or absence of the request for turning-off of the power supply is decided according to whether the power supply switch 33 is set in the off-state. If the answer in step S7 is affirmative (Yes), the flow proceeds to step SB. In step S8, a check is made to find if the second flag F2 is set at �1�. In the first cycle of loop, since the second flag F2 has been cleared to �0� in step S1, the answer in step S8 is negative (No), so that the flow proceeds to step S9. In step S9, a check is made to find if the first flag F1 is set at �1�. In the present cycle of loop, similarly, since the first flag F1 has been cleared to �0� in step S1, the answer in step S9 is negative (No), so that the flow proceeds to step S10.
In step S10, the target output value in the horizontal direction (yawing direction) is so set as to correspond to the central position of the shift lens 7. In the next step S11, the target output value in the vertical direction (pitching direction) is set to the predetermined value A. In this instance, the predetermined value A is such a value as not to make the outer circumferential portion of the lens holding frame 13 holding the shift lens 7 come into contact with the inner wall of the lens barrel 2. In the next step S12, the first flag F1 is set to �1�, and the flow returns to step S2.
With the first flag F1 set to �1�, as described above, the answer in each of step S3 and step S9 becomes affirmative (Yes) in the next and subsequent cycles of loop. Therefore, the flow proceeds from step S9 to Step S13. In step S13, the predetermined value A is set to a value obtained by subtracting a minute amount ΔA from the predetermined value A. In the next step S14, a check is made to find if the predetermined value A has reached a lowest limit value LMTA. If the answer in step S14 is negative (No), the flow proceeds to step S18. In step S18, the target output value in the vertical direction is set to the predetermined value A.
Then, when the predetermined value A has reached the lowest limit value LMTA, the driving amount control part 31 decides that such an amount of movement as to make the lens holding frame 13 come into contact with the lens barrel 2 has been attained, and the flow proceeds to step S15. In step S15, the predetermined value A is set to the lowest limit value LMTA, and in step S16, the second flag F2 is set to �1�. In the next step S17, the power-supply off flag FOFF for allowing turning-off of the power supply is set to �1�, and the flow proceeds to step S18. In step S18, the target output value in the vertical direction is set to the predetermined value A (=LMTA), and the flow returns to step S2. By such a processing operation, the driving of the image pickup optical system 1 is made to stop.
On the other hand, if it is determined in step S7 that the request for turning-off of the power supply is not received, the flow proceeds from step S7 to step S19. In step S19, a check is made to find if the first flag F1 is set at �1�. If the answer in step S19 is negative (No), the flow returns to step S2. If the answer in step S19 is affirmative (Yes), the flow proceeds to step S20. In step S20, the first and second flags F1 and F2 and the power-supply off flag FOFF are cleared to �0�, and, in step S21, the image stabilizing operation is started. Specifically, the connection of the change-over switch 47 is changed over from the side of the predetermined-value output circuit 46 to the side of the integration circuits 45 p and 45 y, and the correction target values are outputted from the driving amount control part 31 to execute the control of the driving amount of the shift lens 7 during the image pickup operation. Then, the flow returns to step S2.
FIG. 6 is a diagram showing the state where the lens holding frame 13 is being driven after the request for turning-off of the power supply is received. Referring to FIG. 6, when the request for tuning-off of the power supply has been received, the lens holding frame 13 moves from a position indicated by the solid line to a position indicated by the one-dot chain line (by the amount of movement A). After that, the lens holding frame 13 moves closer to the lens barrel 2 by the minute amount ΔA, n times (ΔA�n). Finally, the lens holding frame 13 comes into contact with the lens barrel 2, as indicated by the two-dot chain line, and, after that, the power supply is turned off.
Subsequently, in step S12, the first flag F1 is set to �1�, and the flow returns to step S2.
With the first flag F1 set to �1�, as described above, the answer in each of step S3 and step S9 becomes affirmative (Yes) in the next and subsequent cycles of loop. Therefore, the flow proceeds from step S9 to Step S33. In step S33, a predetermined value C is set to a value obtained by subtracting a minute amount AD from the initial data I. In the next step S34, a check is made to find if the predetermined value C is a value not greater than a lowest limit value LMTC. If the answer in step S34 is negative (No), the flow proceeds to step S38. In step S38, the target output value in the vertical direction is set to the predetermined value C, which is sent to the EVR 53. After that, the above operation is repeated. As the output value from the EVR 53 becomes smaller gradually, the output of the amplifier 35 also becomes smaller gradually approximately in proportion to the output value from the EVR 53, so that the shift lens 7 gradually moves from the central position thereof to the inner wall of the lens barrel 2.
Then, when the predetermined value C has reached the lowest limit value LMTC, the driving amount control part 51 decides that such an amount of movement as to make the lens holding frame 13 come into contact with the lens barrel 2 has been attained, and the flow proceeds to step S35. In step S35, the predetermined value C is set to the lowest limit value LMTC, and in step S36, the second flag F2 is set to �1�. In the next step S37, the power-supply off flag FOFF for allowing turning-off of the power supply is set to �1�, and the flow proceeds to step S38. In step S38, the target output value in the vertical direction is set to the predetermined value C (=LMTC), which is sent to the EVR 53, and the flow returns to step S2. By such a processing operation, the driving of the image pickup optical system 1 is made to stop.
On the other hand, if it is determined in step S7 that the request for turning-off of the power supply is not received, the flow proceeds from step S7 to step S19. In step S19, a check is made to find if the first flag F1 is set at �1�. If the answer in step S19 is negative (No), the flow returns to step S2. If the answer in step S19 is affirmative (Yes), the flow proceeds to step S39. In step S39, the initial data I in the vertical direction is sent to the EVR 53, and the flow proceeds to step S40. In step S40, the first and second flags F1 and F2 and the power-supply off flag FOFF are cleared to �0�, and, in step S41, the image stabilizing operation is started. Specifically, the off-state of the image-stabilization turning-off switch 52 is canceled, and the correction target values are outputted from the driving amount control part 51 to execute the control of the driving amount of the shift lens 7 during the image pickup operation. Then, the flow returns to step S2.
After the processing operations in steps S1 to S9 are performed similarly to those in the first and second embodiments (FIG. 5 and FIG. 9), if the answer in step S9 is negative (No), the flow proceeds to step S51. In step S51, the target output value in the horizontal direction is so set as to correspond to the central position of the shift lens 7. In the next step S52, the target output value in the vertical direction (pitching direction) is set to the predetermined value A. Then, in step S53, the EVR initial data I in the vertical direction (pitching direction) is stored in the memory of the driving amount control part 31. In the next step S54, the first flag F1 is set to �1�, and the flow returns to step S2.
With the first flag F1 set to �1�, as described above, the answer in each of step S3 and step S9 becomes affirmative (Yes) in the next and subsequent cycles of loop. Therefore, the flow proceeds from step S9 to Step S55. In step S55, the output of the Hall element 11 is detected. In step S56, a check is made to find if the shift lens 7 (the lens holding frame 13) is located in the position of the inner wall of the lens barrel 2. Specifically, if the theoretical position which the lens holding frame 13 holding the shift lens 7 finally reaches happens to exceed the position of the inner wall of the lens barrel 2, the consumption of electric power would increase. Therefore, according to the third embodiment, the position of the shift lens 7 is always watched by means of the Hall element 11, so that it is made possible to cause the lens holding frame 13 to stop at the position of the inner wall of the lens barrel 2, thereby reducing the consumption of electric power.
Then, if the answer in step S56 is negative (No), the flow proceeds to step S57. In step S57, the predetermined value A is set to a value obtained by subtracting a minute amount ΔA from the predetermined value A. In the next step S58, a check is made to find if the predetermined value A has become not greater than a lowest limit value LMTA. If the answer in step S58 is negative (No), the flow proceeds to step S60. In step S60, a predetermined value C is set to a value obtained by subtracting a minute amount ΔD from the initial data I. In the next step S61, a check is made to find if the predetermined value C is a value not greater than �0�. If the answer in step S61 is negative (No), the flow proceeds to step S63. In step S63, the target output value in the vertical direction is set to the predetermined value A. In the next step S64, the predetermined value C is sent to the EVR 53, and the flow returns to step S2.
On the other hand, if the answer in step S58 is affirmative (Yes), the flow proceeds to step S59. In step S59, the predetermined value A is set to the lowest limit value LMTA, and the flow proceeds to step 60, where the above-described processing operation is performed. Then, if the answer in step S61 becomes affirmative (Yes), the flow proceeds to step S62. In step S62, the predetermined value C is set to �0�. Subsequently, the above-described processing operations in steps S63 and S64 are performed, and the flow returns to step S2.
If the answer in step S56 is affirmative (Yes), i.e., when it is decided that the lens holding frame 13 has reached the inner wall of the lens barrel 2, the flow proceeds to step S65. In step S65, the second flag F2 is set to �1�. In the next step S66, the power-supply off flag FOFF is set to �1�, and the flow returns to step S2.
On the other hand, if it is decided in step S7 that there is no request for turning-off of the power supply, the flow proceeds to step S67. In step S67, a check is made to find if the first flag F1 is set at �1�. If the answer in step S67 is negative (No), the flow returns to step S2. If the answer in step S67 is affirmative (Yes), the flow proceeds to step S68. In step S68, the initial data I in the vertical direction is sent to the EVR 53. In the next step S69, the ordinary image stabilizing operation is performed. Then, in step S70, the first and second flags F1 and F2 and the power-supply off flag FOFF are cleared to �0�, and the flow returns to step S2.
If the magnification varying ratio of the variator lens 5 becomes a high value of 10� or more, as in the image pickup apparatuses in recent years, the so-called �remainder of image shake� becomes conspicuous during the ordinary image stabilizing operation in a case where the resolving power of the image pickup apparatus is not high. Therefore, if the image pickup apparatus is so set as to heighten the resolving power thereof with respect to the actually-usable moving range of the shift lens 7, there occur cases where, in the current image pickup apparatuses, it becomes impossible to cause the lens holding frame 13 to reach the inner wall of the lens barrel 2 however varied the output of the driving amount control part 31 is. Further, with regard to the offset, too, if the resolving power for operation of the shift lens 7 with respect to data to be sent to the EVR 53 is not heightened, in the case of the variator lens 5 having a high magnification varying ratio, the deviation of the optical axis 4 from the central axis of the image pickup optical system becomes conspicuous during the zooming operation even if the optical axis 4 slightly deviates. Accordingly, taking the above cases into consideration, it is necessary to heighten the resolving power for operation of the shift lens 7. In this case, too, however, there is a case where the lens holding frame 13 becomes unable to reach the inner wall of the lens barrel 2 no matter how varied the output of the EVR 53 is.
The output signal change-over circuit 148 includes, as shown in FIG. 13, a signal generator 149 arranged to generate a black signal as a predetermined luminance level signal, and a change-over switch 150. To the contact �a� of the change-over switch 150 is supplied the video signal, to the contact �b� of the change-over switch 150 is supplied the black signal from the signal generator 149, and to the contact �c� of the change-over switch 150 is supplied an output signal of the main microcomputer 134. According to the above arrangement, the contact �c� of the change-over switch 150 is connected to the contact �a� or the contact �b� depending on the output signal of the main microcomputer 134, so that the video signal or the black signal is outputted from the output signal change-over circuit 148. Incidentally, while in the fourth embodiment the predetermined luminance level signal to be outputted from the signal generator 149 is a black signal, it may be changed to a particular color signal, such as a white signal, other than the black signal.
Further, the driving amount control part 131 includes, as shown in FIG. 14, A/D converters 151 p and 151 y arranged to convert the analog vibration signals outputted from the vibration signal forming circuit 130 into digital vibration signals, HPFs 152 p and 152 y arranged to remove predetermined low-frequency components from the output signals of the A/D converters 151 p and 151 y, phase/gain correcting circuits 153 p and 153 y arranged to correct the phase and/or gain of the output signals of the HPFs 152 p and 152 y, integration circuits 154 p and 154 y arranged to integrate the output signals of the phase/gain correcting circuits 153 p and 153 y to form correction target values for correcting the image shake, a predetermined-value output circuit 155 arranged to output a lens-movement target value (a predetermined value X) which is desired irrespective of the vibration signals from the vibration signal forming circuit 130, and a change-over switch 156 arranged to change over the output signals of the integration circuits 154 p and 154 y and the output signal of the predetermined-value output circuit 155. The contact �a� of the change-over switch 156 is connected to the integration circuits 154 p and 154 y, the contact �b� of the change-over switch 156 is connected to the predetermined-value output circuit 155, and the contact �c� of the change-over switch 156 is connected to the mode microcomputer 132. Then, the contact �c� of the change-over switch 156 is connected to the contact �a� or the contact �b� depending on the signal from the mode microcomputer 132, which watches the state of the power supply switch 133, so that the correction target values from the integration circuits 154 p and 154 y or the predetermined value X from the predetermined-value output circuit 155 is outputted from the change-over switch 156.
On the other hand, when the power supply switch 133 is changed over from the on-state to the off-state, a notice of the change-over of the state of the power supply switch 133 is given to the mode microcomputer 132 and, then, to the main microcomputer 134. The main microcomputer 134, which has received such a notice from the mode microcomputer 132, restrains the video signal processing circuit 147 from outputting the RF signal, thereby stopping the recording operation of the recorder 141, and, at the same time, notifies the contact �c� of the change-over switch 150 of the output signal change-over circuit 148 that the power supply switch 133 has been turned off. Accordingly, the connection of the contact �c� of the change-over switch 150 is changed over from the contact �a� to the contact �b�, so that the output terminal 140 is made to be supplied with the black signal from the signal generator 149.
Referring to FIG. 15, in step S101, the whole system is initialized. By this initializing process, first to third flags F1 to F3, which will be described later, are cleared to �0�.
In the next step S104, a check is made through the communication with the mode microcomputer 132 to find if the request for turning-off of the power supply has been received. If the answer in step S104 is affirmative (Yes), the flow proceeds to step S105. In step S105, a check is made to find if the first flag F1 is set at �1�. In the first cycle of loop, since the first flag F1 has been cleared to �0� in step S101, the answer in step S105 is negative (No), so that the flow proceeds to step S106. In step S106, a count value CN of a counter incorporated in the driving amount control part 131 is incremented by one, and the flow proceeds to step S107. In step S107, a check is made to find if the count value C is not less than a setting value C. In this instance, the setting value C is a value equivalent to a predetermined period of time required for the lapse of 20 V (about 16.7 msec in NTSC or about 20 msec in PAL) according to the recording operation state of the recorder 141 upon receipt of the request for turning-off of the power supply. If the answer in step S107 is negative (No), the flow returns to step S102 to repeat the above processing operation until the count value CN of the counter reaches the setting value C, i.e., the predetermined period of time elapses. When the count value CN of the counter reaches the setting value C, the flow proceeds from step S107 to step S108. In step S8, the first flag F1 is set to �1�, and the flow returns to step S102.
With the first flag F1 set to �1�, as described above, the answer in step S105 becomes affirmative (Yes). Therefore, the flow proceeds to step S109 to stop the image stabilizing operation. Specifically, the connection of the change-over switch 156 is changed over from the side of the integration circuits 154 p and 154 y to the side of the predetermined-value output circuit 155.
Subsequently, in step S110, a check is made to find if the second flag F2 is set at �1�. In this cycle of loop, since there is maintained the state where the second flag F2 has been set to �0� in step S101, the answer in step S110 is negative (No), and the flow proceeds to step S111. In step S111, a check is made to find if the third flag F3 is set at �1�. In this cycle of loop, also, since there is maintained the state where the third flag F3 has been set to �0� in step S101, the answer in step S111 is negative (No), and the flow proceeds to step S112. In step S112, the predetermined value X is set to a value �R�. In this instance, the value �R� is such a value as not to make the outer circumferential portion of the lens holding frame 13 holding the shift lens 7 come into contact with the inner wall of the lens barrel 2.
In the next step S113, the third flag F3 is set to �1�, and the flow proceeds to step S119. In step S119, the predetermined value X is outputted as an output value OUT of the driving amount control part 131, and the flow returns to step S102. By the above processing operation, the lens holding frame 13 is made to instantaneously move up to the vicinity of the inner wall of the lens barrel 2.
With the third flag F3 set to �1�, as described above, the answer in step S111 becomes affirmative (Yes) in the next and subsequent cycles of loop. Therefore, the flow proceeds from step S111 to Step S114. In step S114, the predetermined value X is set to a value obtained by subtracting a minute amount AR from the predetermined value X. In the next step S115, a check is made to find if the predetermined value X has become a value not greater than a lowest limit value LLMT. If the answer in step S115 is negative (No), the flow proceeds to step S119. In step S119, the predetermined value X (=X−ΔR) is outputted as the output value OUT of the driving amount control part 131, and the flow returns to step S2.
Then, the above processing operation is repeated until the predetermined value X reaches the lowest limit value LLMT. When the predetermined value X has become not greater than the lowest limit value LLMT, the driving amount control part 131 decides that such an amount of movement as to make the lens holding frame 13 come into contact with the lens barrel 2 has been attained, and the flow proceeds to step S116. In step S116, the predetermined value X is set to the lowest limit value LLMT, and in step S117, the second flag F2 is set to �1�. In the next step S118, the power-supply off flag FOFF for allowing turning-off of the power supply is set to �1�, and the flow proceeds to step S119. In step S119, the predetermined value X is outputted as the output value OUT of the driving amount control part 131, and the flow returns to step S102. By such a processing operation, the driving of the image pickup optical system 1 is made to stop.
On the other hand, if it is determined in step S104 that the request for turning-off of the power supply is not received, i.e., if the power supply switch 133 is not turned off, the flow proceeds from step S104 to step S20. In step S120, the count value CN of the counter is cleared to �0�. In the next step S121, a check is made to find if the first flag F1 is set at �1�. If the answer in step S121 is negative (No), the flow returns to step S102. If the answer in step S121 is affirmative (Yes), the flow proceeds to step S122. In step S122, the first to third flags F1 to F3 are cleared to �0�. In the next step S123, the power-supply off flag FOFF is cleared to �0�, and, in step S124, the image stabilizing operation is started. Then, the flow returns to step S102. Specifically, the connection of the change-over switch 156 is changed over from the side of the predetermined-value output circuit 155 to the side of the integration circuits 154 p and 154 y, and the correction target values are outputted from the driving amount control part 131 to execute the control of the driving amount of the shift lens 7 during the image pickup operation.
FIG. 16 is a diagram showing the state where the lens holding frame 13 is being driven after the request for turning-off of the power supply is received. Referring to FIG. 16, when a predetermined period of time equivalent to, for example, 20 V has elapsed after the receipt of the request for tuning-off of the power supply, the lens holding frame 13 moves from a position indicated by the solid line to a position indicated by the one-dot chain line (by the amount of movement R). After that, the lens holding frame 13 moves closer to the lens barrel 2 by the minute amount ΔR, n times (ΔR�n). Finally, the lens holding frame 13 comes into contact with the lens barrel 2, as indicated by the two-dot chain line, and, after that, the power supply is turned off.
Then, in a case where the recorder 141 is in the process of recording a video signal on a magnetic tape, the main microcomputer 134 detects the stoppage of the recording mode at a point of time t4 at which a predetermined period of time T required for the completion of the stopping operation has elapsed (FIG. 17(c)). At the same time, the connection of the changeover switch 156 of the driving amount control part 131 is changed over to the side of the predetermined-value output circuit 155, and the control operation of the driving amount of the shift lens 7 at the time of turning-off of the power supply is performed (FIG. 17(d)). Then, at a point of time t5 at which the lens holding frame 13 holding the shift lens 7 has come into contact with the inner wall of the lens barrel 2 to terminate the control operation of the driving amount of the shift lens 7, the power-supply off flag FOFF is set to �1� to output an instruction for allowing the turning-off of the power supply (FIG. 17(e)).
On the other hand, in a case where the recorder 141 is not performing the recording operation, for example, when the recorder 141 is not loaded with any magnetic tape, it is not necessary to wait for the predetermined period of time T, because the predetermined period of time T is a waiting time required for ending the recording operation of the recorder 141 on the magnetic tape at the time of turning-off of the power supply. Accordingly, in this case, at the same time that the mode microcomputer 132 notifies the main microcomputer 134 and the driving amount control part 131 of the turning-off of the power supply switch 133 at the point of time t2 (FIG. 17(b)), the main microcomputer 134 detects the stoppage of the recording mode, as indicated by a broken line in FIG. 17(c), and starts the control operation of the movement of the shift lens 7 at the point of time t2, as indicated by a broken line in FIG. 17(d). Then, at a point of time t3 at which the lens holding frame 13 has come into contact with the inner wall of the lens barrel 2 to end the control operation of the movement of the shift lens 7, the power-supply off flag FOFF is set to �1� to output an instruction for allowing the turning-off of the power supply, as indicated by a broken line in FIG. 17(e).
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