JP5053693B2 - Image blur correction apparatus or optical apparatus and image pickup apparatus including the same - Google Patents

Description

The present invention relates to an image blur correction apparatus having a function of correcting image blur, an optical apparatus including the same, and an imaging apparatus.

2. Description of the Related Art Many imaging devices represented by still cameras and video cameras in recent years are provided with a shake correction device that corrects image shake due to shake given from outside. As a shake correction method in this type of shake correction device, there are a method for driving an optical lens, a method for driving an image sensor, and the like. The shake correction device comprising these methods performs a calculation centering on a process for performing a predetermined frequency cutoff on a signal from a shake sensor that detects the degree of shake and an integration process for matching the input and output units. By doing so, the shake correction amount is calculated.

  Here, an angular velocity sensor is often used as a shake sensor for detecting the degree of shake. This angular velocity sensor obtains angular velocity information by vibrating a vibrating material such as a piezoelectric element at a constant frequency and converting a force due to a Coriolis force generated by a rotational motion component into a voltage. The directions for detecting this shake are generally the vertical direction (pitch) and the horizontal direction (yaw) when the imaging apparatus is arranged at the center of the orthogonal coordinate system (see FIG. 1).

  The optical shake correction apparatus has a structure that removes shake from an image formed on an image sensor by moving a shift lens as a correction unit that moves in a substantially vertical plane by a shake correction amount. . A shake correction apparatus using an image pickup device has a structure that removes shake from an image by moving an image pickup device as correction means that moves in a substantially vertical plane by a shake correction amount. Since any of these types of apparatuses is related to the present invention, the following description will be made with an optical shake correction apparatus as a representative example.

  In the imaging apparatus including the shake correction device, the shift lens driving unit is instructed to move the shake correction amount, and when the shift lens to be controlled moves to the target position, the actual position of the shift lens is acquired. . Then, feedback control is performed so that the deviation between the target position and the actual position of the shift lens becomes zero.

  In general, feedback control uses a control method called PID control. The D control (differential control) is used to improve the decrease in the gain margin GM and the phase margin PM due to the overcompensation of the P control (proportional control) and to improve the stability of the feedback control. I control (integral control) is used to improve the offset characteristics of feedback control. Feedback control in which these P control, I control, and D control are selected and combined as necessary is called PID control.

  As a result, image blur correction is performed by driving the shift lens in a direction to cancel image blur.

As a desirable characteristic of the mechanism for realizing the shake correction device,
1) The friction is small and the target is well tracked. 2) The designer can easily operate the resonance frequency. Patent Document 1 has been proposed as a mechanism for realizing these.

  A feature of the mechanism disclosed in Patent Document 1 is that a plurality of ball members are sandwiched between a movable lens barrel and a fixed lens barrel and pressed by an elastic body. With such a configuration, the movable lens barrel can be driven by rolling friction, and the frictional force can be reduced. Further, since the resonance frequency is determined by the ratio of the weight of the movable lens barrel and the elastic coefficient of the elastic body, the target resonance frequency can be easily obtained. As a result, a mechanism capable of obtaining good controllability and appropriately responding to small vibrations is realized.

  In the mechanism as shown in Patent Document 1, it is desirable that the ball member is always in a rolling state. This is because in a state in which the end face of the receiving portion of the ball member is in contact with the ball member, sliding friction occurs, and follow-up performance is reduced. Therefore, Patent Document 1 discloses that initialization is performed by moving in advance by the maximum movement amount or the actual movement amount.

Patent Document 2 discloses the initialization timing of the shift lens, which is a correction means. According to this, it is disclosed that the shift lens is initialized in conjunction with the insertion and removal of the battery. However, the movable lens barrel is not smoothly driven by holding the ball member between the movable lens barrel and the fixed lens barrel.
JP 2001-290184 A JP-A-7-270846

  According to Patent Documents 1 and 2, it is possible to perform initialization by moving the maximum movement amount or the actual movement amount in advance. Here, consider the case where the shift lens is initialized and fixed at the center of the movable range when the display is turned off, or the power supply for shake correction is stopped in the power saving mode such as the menu screen display during reproduction. In such a case, if the shift lens position remains in the initialized state, the ball member in contact with the shift lens remains in the shake correction movable range (shift lens movable range). In this state, if a strong impact is applied to the imaging device for a long period of time, such as vibration, drop, or external force, pressure is applied to the surface of the ball member and the receiving portion that is in contact with the ball member, resulting in rough surfaces or dents Sometimes it comes on.

  Therefore, when the posture of the image pickup apparatus is detected based on a signal related to the driving force of the driving means of the shift lens in a state where shake correction is being performed, the driving force changes due to this surface roughness or dent, It was falsely detected. In addition, when the roughness or the dent is severe, there is a possibility that the shake correction performance is deteriorated.

(Object of invention)
An object of the present invention is to provide an image blur correction device that can prevent surface roughness and dents of a receiving portion of a ball member due to shock caused by vibration or dropping, and can eliminate erroneous detection of posture detection of the imaging device and deterioration of shake correction performance. Alternatively, the present invention intends to provide an optical apparatus and an imaging apparatus provided with the same.

To achieve the above object, the present invention includes holding means for holding the correction means to correct image blur by deflecting the optical axis, a fixing means for supporting said holding means moves capable, the Nipped between the holding means and the fixing means, and when the holding means moves relative to the fixing means, it rolls in a receiving portion formed on at least one of the holding means and the fixing means. and the ball member, drive means for driving movement of the pre-Symbol holding means, the state of the image pickup apparatus, a shake correction power stopping means stops the power supply to the drive means, by the shake correction power supply stop means When the power supply to the driving means is stopped, immediately before the power supply to the driving means is stopped, the holding means is driven to retract the ball member out of the shake correction movable range in the receiving portion. Evacuation control It is an image stabilizer characterized by having a stage.

According to the present invention, the image blur correction device can prevent surface roughness and dent of the receiving portion of the ball member due to vibration or impact caused by dropping, and can eliminate erroneous detection of posture detection of the imaging device and deterioration of shake correction performance. Alternatively, it is possible to provide an optical apparatus and an imaging apparatus including the same.

  The best mode for carrying out the present invention is as shown in Examples 1 and 2 below.

  FIG. 2 is a block diagram illustrating a configuration of the imaging apparatus according to the first embodiment of the present invention. This imaging device is a digital camera mainly for taking still images.

  In FIG. 1, reference numeral 101 denotes a zoom unit, which includes a zoom lens that performs zooming. Reference numeral 102 denotes a zoom drive control unit that controls the drive of the zoom unit 101. Reference numeral 103 denotes a shift lens (unit) as a shake correction optical system capable of changing the position on a plane perpendicular to the optical axis. A shift lens drive control unit 104 controls the drive of the shift lens 103. Further, the drive power supply is stopped depending on the state of the imaging apparatus (for example, when power is saved). Reference numeral 105 denotes an aperture / shutter unit. Reference numeral 106 denotes an aperture / shutter drive control unit, which controls the drive of the aperture / shutter unit 105. A focus unit 107 includes a lens that performs focus adjustment. A focus drive control unit 108 controls the drive of the focus unit 107. Reference numeral 109 denotes an image pickup unit in which an image pickup element is used, and converts an optical image that has passed through each lens group into an electric signal.

  Reference numeral 110 denotes an imaging signal processing unit that converts an electrical signal output from the imaging unit 109 into a video signal. A video signal processing unit 111 processes the video signal output from the imaging signal processing unit 110 according to the application. Reference numeral 112 denotes a display unit, which displays an image as necessary based on a signal output from the video signal processing unit 111. Reference numeral 113 denotes a display control unit that controls the operation and display of the imaging unit 109 and the display unit 112. Reference numeral 114 denotes an attitude information control unit that sets the attitude of the photographing apparatus with respect to the video signal processing unit 111 and the display unit 112. Specifically, in the video signal processing unit 111, posture information at the time of photographing is described as an accompanying item in the photographed image. Further, the display unit 112 adjusts the display direction in accordance with the posture in response to an instruction from the posture information control unit 114 immediately after shooting. In the image reproduction in the reproduction mode, the display orientation is adjusted according to the posture information read from the accompanying item.

  Reference numeral 115 denotes a power supply unit that supplies power to the entire system according to the application. An external input / output terminal unit 116 inputs / outputs communication signals and video signals to / from the outside. Reference numeral 117 denotes an operation unit for operating the system. Reference numeral 118 denotes a storage unit that stores various data such as video information. A control unit 119 controls the entire system.

  Next, the operation of the imaging apparatus having the above configuration will be described.

The operation unit 117 includes a shutter release button configured such that a first switch (hereinafter referred to as switch SW1) and a second switch (hereinafter referred to as switch SW2) are sequentially turned on in accordance with the pressing amount. The switch SW1 is turned on when the shutter release button is pressed about halfway, and the switch SW2 is turned on when the shutter release button is fully pressed. When the switch SW1 is turned on, the focus drive control unit 108 drives the focus unit 107 to perform focus adjustment, and the aperture / shutter drive control unit 106 drives the aperture / shutter unit 105 to set an appropriate exposure amount. To do. When the switch SW2 is further turned on, the image data obtained from the light image exposed to the imaging unit 109 is stored in the storage unit 118.

  When storing the image data, if the shake correction switch included in the operation unit 117 is ON, the control unit 119 instructs the shift lens drive control unit 104 to perform an image stabilization operation, and receives the shift lens drive control unit 104. Performs the image stabilization operation until an instruction for image stabilization OFF is given. In addition, when the operation unit 117 has not been operated for a certain period of time, the control unit 119 issues an instruction to shut off the power source of the display for power saving.

  In this imaging apparatus, one of the still image shooting mode and the moving image shooting mode can be selected by a mode switch included in the operation unit 117, and the operating condition of each actuator can be changed in each mode.

  When a zooming instruction is given by the zoom switch included in the operation unit 117, the zoom drive control unit 102 that has received the instruction via the control unit 119 drives the zoom unit 101, and the zoom unit 101 is moved to the instructed zoom position. To move. At the same time, based on the image information processed by the signal processing units 110 and 111 sent from the image capturing unit 109, the focus drive control unit 108 drives the focus unit 107 to perform focus adjustment.

  FIG. 3 is a block diagram showing a configuration of the shift lens drive control unit 104 shown in FIG.

  In FIG. 3, reference numeral 201 denotes a pitch direction shake sensor, which detects a shake in the vertical direction (pitch direction) of the imaging apparatus in a normal posture (an attitude in which the length direction of the image frame substantially coincides with the horizontal direction). Reference numeral 202 denotes a yaw direction shake sensor that detects a shake in the horizontal direction (yaw direction) of the image pickup apparatus in the normal posture. Reference numerals 203 and 204 denote anti-shake (shake correction) control units that determine drive target positions in the pitch direction and yaw direction, respectively, and perform anti-shake control and shift lens position control according to the situation.

  Reference numerals 205 and 206 denote PID units as feedback control means, which determine the control amount from the deviation between the correction position control signal in the pitch direction and the yaw direction and the position signal indicating the position of the shift lens 103, and determine the position of the shift lens 103. A command signal is output. Reference numerals 207 and 208 denote drive units, which drive the shift lens 103 based on the position command signals sent from the PID units 205 and 206. Reference numerals 209 and 210 denote Hall elements, which detect the positions of the shift lens 103 in the pitch direction and the yaw direction, respectively.

  Next, position control of the shift lens 103 in the shift lens drive control unit 104 will be described.

  In the position control of the shift lens 103, the shift lens 103 is driven in each direction based on a shake signal (angular velocity signal) indicating shake in the pitch direction and yaw direction of the imaging device from the shake sensors 201 and 202. A magnet is attached to the shift lens 103, the magnetic field of the magnet is detected by the Hall elements 209 and 210, and position signals indicating the actual position of the shift lens 103 are sent to the PID units 205 and 206, respectively. The PID units 205 and 206 perform feedback control such that these position signals converge on the corrected position control signals sent from the image stabilization control units 203 and 204, respectively.

  Since the position signals output from the Hall elements 209 and 210 have individual variations, the Hall elements 209 and 210 of the Hall elements 209 and 210 are moved so that the shift lens 103 moves to a predetermined position with respect to a predetermined correction position control signal. It is necessary to adjust the output. At this time, the PID units 205 and 206 perform PID control in which proportional control, integral control, and differential control are selectively combined. In addition, posture detection is performed by the posture detection unit 211 based on signals used in the PID units 205 and 206.

  Based on shake signals from the shake sensors 201 and 202, the image stabilization controllers 203 and 204 are correction position control signals (drive target positions) for moving the shift lens 103 in a direction to correct image shake due to shake of the imaging apparatus. ) Respectively. As a result, even if shake such as camera shake occurs in the imaging apparatus, image shake due to the shake can be prevented.

  FIG. 4 is a block diagram showing a detailed configuration of the PID unit 205 shown in FIG. The PID unit 206 has the same configuration, and only the PID unit 205 for the pitch direction will be described here.

  The deviation calculation unit 302 calculates a difference between a shake correction position that is an output value of the image stabilization control unit 203 and an actual position that is a position signal from the Hall element 209 via the D / A conversion unit 308. This deviation is calculated by the proportional control unit 303 (P control unit), the differential control unit 304 (D control unit), and the integral control unit 305 (I control unit). The proportional control unit 303 performs control to bring the deviation closer to zero, that is, to bring the shake position that is the target position closer to the actual position. However, since only the proportional control unit 303 steadily adds an offset component to the deviation, the integral control unit 305 performs control to make the offset component asymptotic to zero.

When the orientation of the imaging apparatus changes, that is, when the direction of gravity applied to the shift lens 103 changes, the offset component shows a variation corresponding to the orientation change, like the actual position of the shift lens 103. The output of the integration control unit 305 is passed to the posture detection unit 211 for posture determination. Further, in order to improve the responsiveness of the shift lens 103, the differential control unit 304 performs differential control on the deviation.

Finally, the result of the proportional control unit 303, the result of the differential control unit 304 , and the result of the integration control unit 305 are added together by the sum calculation unit 306, and passed to the drive unit 208 as an analog signal by the D / A conversion 307, and the shift lens 103 is driven.

  FIG. 5 is a perspective view illustrating the structure of the shake correction apparatus according to the first embodiment.

  Reference numeral 401 denotes a base which is a base of the shake correction apparatus, and simultaneously holds and holds the shutter mechanism and the ND filter mechanism. The base 401 is integrally provided with two follower pins 402 and a movable follower pin (not shown). The three follower pins described above are fitted into three cam grooves (not shown) on the radially outer side of the base 401 so as to advance and retreat in the optical axis direction along the cam grooves. The details are omitted.

  Reference numeral 406 denotes a correction lens group corresponding to the shift lens 103, which is integrally held by the shift lens holder 416 by a caulking claw (not shown). Reference numeral 403 denotes a lens cover provided with an opening for restricting a light beam passing through the correction lens group 406, and an opening 405 is provided in each of three arm portions 404 extending on the side surface. Then, the lens cover 403 is integrally held by the shift lens holder 416 by fitting into the openings 405 with projections 415 provided at three positions on the side surface of the shift lens holder 416. Magnets 412 and 413 are integrally held by the shift lens holder 416.

  The shift lens holder 416 is connected to the base 401 via three rolling balls 407, and can freely move in a plane perpendicular to the optical axis when the rolling balls 407 roll. Compared to the guide bar guide method, this method has the effect of realizing a higher period of vibration with a smaller amplitude, and it is possible to perform good correction even in a digital camera with higher pixels. Become.

  Reference numeral 414 denotes a thrust spring that biases the shift lens holder 416 toward the base 401, and reference numerals 417 and 418 denote radial springs for preventing the shift lens holder 416 from rotating. The thrust spring 414 is a tension spring, one end of which engages with a hooking claw (not shown) of the shift lens holder 416 and the other end engages with a hooking claw (not shown) of the base 401 to give a biasing force.

  Reference numerals 408 and 409 denote coils. Reference numerals 410 and 411 denote resin bobbins that hold the coils 408 and 409. A metal pin is integrally formed at the tip, and ends of the coils 408 and 409 are entangled. Electric power is supplied from the control circuit by soldering a conductive pattern of a flexible substrate (hereinafter referred to as FPC), which will be described later, to the metal pins.

  Reference numeral 424 denotes an FPC for supplying power to the coils 408 and 409, and the coils 408 and 409 are electrically connected to each other by solder on the land 425 through metal pins. Reference numerals 422 and 423 denote Hall elements (corresponding to the Hall elements 209 and 210 in FIG. 3) for detecting a change in the magnetic field, which are arranged close to the magnets 412 and 413 and are generated by the movement of the magnets 412 and 413. The amount of movement is calculated by detecting the change in. The Hall elements 422 and 423 are also mounted on the FPC 424, and power is supplied by the FPC 424.

  Reference numeral 426 denotes an FPC for supplying power to the shutter and the ND filter driving unit. Reference numeral 420 denotes an FPC holder for fixing the FPCs 424 and 426. The holes of the FPCs 424 and 426 are press-fitted into a cylindrical projection 421 so that the FPCs 424 and 426 are positioned and fixed.

  FIG. 6 is a front view of the shake correction apparatus shown in FIG. 5 as viewed from the subject side.

  Reference numeral 428 denotes a concave portion (hereinafter referred to as a receiving portion) provided in the base member 401, and is disposed at the apex of a triangle formed by the rolling ball 407 in the vicinity of the correction lens group 406 (in the vicinity of the shift lens 103). One rolling ball 407 enters each of the three receiving portions 428, and the rolling ball 407 is in pressure contact with the shift lens holder 416.

  FIG. 7A is an image diagram showing the arrangement of the rolling balls 407 in the receiving portion 428 in three dimensions, and FIG. 7B is a front view of the image diagram viewed from the subject side.

  In the front view of FIG. 7B, the contact point (hereinafter referred to as contact) between the rolling ball 407 and the receiving portion 428 coincides with the center of the rolling ball 407.

  In the first embodiment, ceramic balls are used for the rolling balls 407 that are ball members, and a molding material is used for the receiving portion 428. At the contact point, when a large vibration or strong impact is applied to the image pickup apparatus, the receiving surface becomes rough or a dent is formed. The receiving portion 428 is disposed at the apex of the triangle formed by the rolling ball 407 in the vicinity of the shift lens 103. Since the three combinations of the receiving portion 428 and the rolling ball 407 have the same configuration, The description describes any one combination.

  FIG. 8 is a view of the receiving portion 428 as a plane. The circle drawn with a dotted line in FIG. 8 indicates the shake correction movable range (shift lens possible range) after initialization, and the contact moves within the dotted circle during shake correction. Here, the shake correction movable range is a range in which a diameter is determined in advance so that optical performance can be guaranteed at a certain level even if the shift lens 103 is shifted during shake correction. When the shift lens 103 moves integrally with the shift lens holder 416 within this shake correction movable range, the rolling ball 407 rolls in contact with the base 401 within this dotted circle and supports the shift lens holder 416. is doing.

  While the rolling ball 407 rolls within this dotted circle, it does not reach the wall surface of the receiving portion 428. Therefore, while the shift lens 103 is shifted for shake correction, the shift lens holder 416 is caused by rolling friction. Can be supported, and the frictional resistance is reduced.

  In addition, the initialization operation is performed by shifting the shift lens holder 416 to a greater extent than when performing shake correction, and once the rolling ball 407 strikes the wall surface of the receiving portion 428 and shifts in the reverse direction by a predetermined amount, This is performed by separating the ball 407 from the wall surface of the receiving portion 428. By performing this in at least two axial directions, it is possible to secure a shake correction movable range in consideration of a margin from the wall surface of the receiving portion 428.

  FIG. 9 is a diagram illustrating the contact state when the shift lens 103 (correction lens group 406) is retracted out of the shake correction movable range.

  As a specific retraction method, as described above, since the shake correction movable range has a predetermined diameter that guarantees optical performance, the shift lens 103 is shifted in an amount greater than this diameter in a predetermined direction. That's fine. If the shift lens 103 is shifted in this way, the rolling ball 407 also rolls away from the shake correction range.

  At the time of shake correction, as shown in FIG. 8, the contact is moving within the shake correction movable range of the dotted circle. However, when a retraction instruction is received as will be described later, as shown in FIG. 9, the shift lens 103 is driven so that the contact is outside the shake correction movable range.

  FIG. 10 is a flowchart for explaining a shake correction (anti-shake) operation performed in the imaging apparatus shown in FIG. 2 and a procedure for retracting the shift lens out of the shake correction movable range.

  When the power switch included in the operation unit 117 is turned on and the power of the imaging apparatus is turned on, the process proceeds to step S101, and the power for driving the shift lens is turned on. In the next step S102, the shift lens 103 is controlled by executing PID control, and in the subsequent step S103, the power saving mode in which the image stabilization (shake correction) control by the shift lens 103 is not performed is performed depending on the operation state of the imaging device. Determine whether to set. For example, the power saving mode is set on a menu screen that does not require shake correction control during playback and does not perform posture detection.

If was in the power saving mode in step S 103, the process proceeds to step S104, the OFF shake correction mode at the next step S105, it performs the save instruction of the shift lens 103. As a result, the shift lens 103 is driven to perform an operation of retracting the contact point, that is, the rolling ball 407 which is a spherical member, out of the shake correction movable range in the portion 428 as shown in FIG. In step S106, the power supply for driving the shift lens is turned off. In subsequent step S107, when the power saving mode is canceled depending on the operation state of the imaging apparatus, the process returns to step S101, and the power source for driving the shift lens is turned on.

  Steps S103 to S106 are operations for retracting the shift lens 103 out of the shake correction movable range when the shift lens driving is set to the power saving mode. By this retreating operation, it is possible to prevent the surface of the receiving portion from becoming rough within the shake correction movable range when there is intense vibration or strong drop impact in the power saving mode.

  Next, normal shift lens control and posture detection operation by shift lens driving will be described.

  If it is determined in step S103 that the shift lens drive is not set to the power saving mode, the process proceeds to step S108, and it is determined whether or not the shake correction mode is set to ON by the shake correction switch included in the operation unit 117. To do. As a result, if the shake correction mode is set to ON, the process proceeds to step S113, and if the shake correction mode is set to OFF, the process proceeds to step S109.

  When the process proceeds to step S109 assuming that the shake correction mode is set to OFF, the shift lens 103 is fixed at the optical axis center position by PID control. As a result, center fixing without offset becomes possible. In the next step S110, it is determined whether or not the measured value of the timer t that is measuring has reached a certain period T, and if not, the process proceeds to step S112. If the measured value of the timer t has reached a certain period T, the process proceeds to step 111, where the attitude detection unit 211 performs attitude detection using an integral control coefficient for PID control. At this time, the timer t is initialized to 0, and posture detection is intermittently performed at a certain fixed period T. Thereafter, the process proceeds to step S112. In step S112, it is determined whether or not the power switch is ON. If it is ON, the process returns to step S102, and the same operation is repeated thereafter. If the power switch is OFF, the shake correction operation is terminated.

  If it is determined in step S108 that the shake correction mode is set to ON and the process proceeds to step S113, image stabilization control by PID control is performed. In the image stabilization control based on the PID control, the image stabilization performance is slightly inferior to that in the PD control. However, during this period, the image data is not actually stored in the storage unit 118, but only the image is displayed on the display unit 112. ,No problem. Further, even during vibration isolation during PID control, timer measurement is performed in step S110, and posture detection is performed using an integral control value for each fixed period T.

  In the next step S114, it is determined whether or not the switch SW2 is turned on. If it is not turned on, the process proceeds to step S110 at the time of image stabilization during PID control, and timer measurement is performed at regular intervals T. Attitude detection is performed using the integral control value.

  If the switch SW2 is ON in step S114, the process proceeds to step S115, and the integral control value in PID control is held. Then, in the next step S116, PD control is performed while maintaining the integral control value. Thereby, it becomes possible to eliminate the offset from the target value by the P control. In the next step S117, an exposure sequence is executed, and in the subsequent step S118, when image data storage (exposure) is completed in the storage unit 118 after an arbitrary time, the process returns to step S102, and PID control is performed again. . At this time, the held integral control value is updated to the shift lens control value in the PID control.

According to the first embodiment, when the imaging apparatus shifts to the power saving mode (power saving state), in other words, when the image blur correction by the correcting unit is not required, the power supply for driving the shift lens is supplied. Will stop. When the power supply is thus stopped, the shift lens 103 is retracted out of the shake correction movable range immediately before the power supply is stopped. As a result, it is possible to prevent surface roughness and dents in the shake correction movable range of the receiving portion 428 of the rolling ball 407 due to vibrations or impact caused by dropping during the power saving mode. Therefore, it is possible to prevent erroneous detection at the time of detecting the attitude of the image pickup apparatus (using the integral control value) using the image stabilization control signal and a decrease in the image stabilization performance.

  In addition to the power saving mode, the operating state of the photographic device that stops driving the shift lens includes menu screen display in playback mode, slide show operation, movie playback, voice recorder operation, and video terminal external output. Can be mentioned.

  Next, a second embodiment of the present invention will be described. The configuration of the imaging apparatus according to the second embodiment is the same as that of the imaging apparatus according to the first embodiment.

  FIG. 11 is a flowchart for explaining a shake correction (anti-shake) operation performed in the imaging apparatus according to the second embodiment of the present invention and a procedure for retracting the shift lens 103 out of the shake correction movable range. The same parts as those in FIG. 10 in the first embodiment are denoted by the same step numbers, and the description thereof is omitted.

  In step S201, it is determined whether or not there has been no operation signal from the operation unit 117 for a certain period of time (no operation has been performed). If there is an operation signal, the operation from step S108 is performed.

On the other hand, if there is no operation signal from the operation unit 117, the process proceeds to step S202, and the power of the imaging unit 109 and the display unit 112 is turned off by the display control unit 113 to save power of the imaging apparatus. Here, in the second embodiment, the display unit 112 uses a liquid crystal display. Thereafter, the process proceeds to step S203 where the shake correction is turned OFF, and in the next step S204, the shift lens 103 is driven to retract the rolling ball 407 out of the shake correction movable range of the receiving portion 428 . Therefore, in the power saving mode in which the display of the liquid crystal display is turned off when there is no operation for a certain period of time, even if the imaging apparatus is subjected to intense vibration or strong impact due to dropping, the vibration compensation range of the receiving portion 428 is not exceeded. It is possible to avoid rough and dent marks.

In the next step S205, the presence / absence of an operation signal from the operation unit 117 is determined, and when there is no operation signal, the process returns to step S204, and the shift lens 103 is driven to receive the rolling ball 407 outside the shake correction movable range of the unit 428. The same operation of evacuating is continued. Thereafter, when it is determined that there is an operation signal from the operation unit 117, the process proceeds to step S206, where the retraction of the shift lens 103 is canceled and the normal shift lens control is resumed. In the next step S207, liquid crystal display is performed, and the process returns to step S102 to perform normal shift lens control.

According to the second embodiment, when the operation unit 117 is not operated for a certain period of time, in other words, when the image blur correction by the correction unit is not required, the shift lens 103 is driven and the rolling ball 407 is driven. The receiving portion 428 is retracted outside the shake correction movable range. As a result, as in the first embodiment, it is possible to prevent surface roughness and dents within the shake correction movable range in the receiving portion 428 of the rolling ball 407 due to vibration or drop impact during the power saving mode. Therefore, it is possible to prevent erroneous detection at the time of detecting the attitude of the image pickup apparatus (using the integral control value) using the image stabilization control signal and a decrease in the image stabilization performance.

  Further, since the liquid crystal display is not displayed while the shift lens 103 is retracted out of the shake correction movable range, the change in the angle of view at the time of retracting is not displayed.

  Next, Embodiment 3 of the present invention will be described. The configuration of the imaging apparatus according to the third embodiment is the same as that of the imaging apparatus according to the first embodiment.

  FIG. 12 is a flowchart for explaining a shake correction (anti-shake) operation performed in the image pickup apparatus according to Embodiment 3 of the present invention and a procedure for retracting the shift lens 103 out of the shake correction movable range. The same parts as those in FIG. 10 in the first embodiment are denoted by the same step numbers, and the description thereof is omitted.

  In step S301, it is determined whether or not a shake amount large enough to prevent image stabilization control from being output from the shake sensors 201 and 202 is output for a certain period of time. Perform the operation.

On the other hand, if the shake sensor 201, 202 outputs a shake amount that is so large that the image stabilization control cannot be performed, the process proceeds to step S302. Then, the shift lens 103 is driven to prevent the receiving portion 428 from being rough, and the rolling ball 407 is retracted outside the shake correction movable range of the receiving portion 428 . In the next step S303, the outputs from the shake sensors 201 and 202 are continuously observed, and the process returns to step S302 until the shake amount is confirmed to be small for a predetermined time or more, and the same operation is continued. Thereafter, when it is confirmed that the shake amount from the shake sensors 201 and 202 is small for a certain time or longer, the process proceeds to step S304, the retraction of the shift lens 103 is released, and the process returns to step S102 to perform normal shift lens control.

According to the third embodiment described above, when the shake sensor 201, 202 outputs a large shake amount that is equal to or greater than the threshold value for a certain time, the shift lens 103 is driven and the rolling ball 407 receives the shake correction movable portion 428. Evacuate out of range. As a result, it is possible to prevent surface roughness and dents in the shake correction movable range in the receiving portion 428 of the rolling ball 407 during an impact due to dropping or the like. Therefore, it is possible to prevent erroneous detection at the time of detecting the attitude of the image pickup apparatus (using the integral control value) using the image stabilization control signal and a decrease in the image stabilization performance.

  Next, a fourth embodiment of the present invention will be described. The configuration of the imaging apparatus according to the fourth embodiment is the same as that of the imaging apparatus according to the first embodiment.

  FIG. 13 is a flowchart for explaining a shake correction (anti-shake) operation performed in the imaging apparatus according to the fourth embodiment of the present invention and a procedure for retracting the shift lens out of the shake correction movable range. The same parts as those in FIG. 10 in the first embodiment are denoted by the same step numbers, and the description thereof is omitted.

When the power switch included in the operation unit 117 is turned off in step 112, the process proceeds to step 401, where the shift lens 103 is driven to retract the rolling ball 407 out of the shake correction movable range of the unit 428 . In the next step S402, the driving of the shift lens 103 is stopped and the power supply of the image pickup apparatus is turned off.

According to the above-described fourth embodiment, the image stabilization control is not performed after the power is turned off, but the rolling ball 407 is kept outside the shake correction movable range of the receiving portion 428 as much as possible. Thereby, it is possible to prevent surface roughness and dents in the shake correction movable range in the receiving portion 428 of the rolling ball 407 due to an impact caused by vibration or dropping after the power is turned off. Therefore, it is possible to prevent erroneous detection at the time of detecting the attitude of the image pickup apparatus (using the integral control value) using the image stabilization control signal and a decrease in the image stabilization performance.

  In each of the above-described embodiments, the shift lens 103 is used as a correction unit for correcting image blur. However, the present invention corrects shake by moving on a plane perpendicular to the variable apex prism and the optical axis. The imaging unit 109 can also be applied.

  Although the receiving portion 428 is formed on the base 401, it may be formed on the shift lens holder 416 side or on both the base 401 and the shift lens holder 416.

(Correspondence between the present invention and the embodiment)
The shift lens 103 supports the correction means of the present invention, the shift lens holder 416 holds the correction means, and the base 401 supports the correction means movably in a plane perpendicular to the optical axis via the holding means. Each corresponds to a fixing means. Further, the rolling ball 407 is sandwiched between the holding means and the fixing means of the present invention, and is formed on at least one of the holding means and the fixing means when the holding means moves relative to the fixing means. This corresponds to a ball member that rolls within the receiving portion. Further, the receiving portion 428 corresponds to the receiving portion formed in either one of the holding means and the fixing means of the present invention. The coils 408 and 409 and the magnets 412 and 413 correspond to the driving means of the present invention, and the shift lens drive control unit 104 corresponds to the shake correction power supply stopping means. Further, when the portion of the control unit 119 that executes the operations of, for example, steps S103 to S107 in FIG. This corresponds to retraction control means for retreating out of the shake correction movable range. The operation unit 117 corresponds to the operation member of the present invention.

It is a figure which shows the shake direction of the imaging device which concerns on this invention. It is a figure which shows the structure of the imaging device which concerns on each Example of this invention. It is a block diagram which shows the structure of the shift lens drive control part of FIG. It is a block diagram which shows the structure of the PID part of FIG. It is a disassembled perspective view which shows the mechanical structure of the shake correction apparatus which concerns on each Example of this invention. FIG. 6 is a front view of the shake correction apparatus of FIG. 5. It is a figure which shows the relationship between the rolling ball which is a spherical member which concerns on each Example of this invention, and a receiving part. It is a figure which shows the contact of the shake correction movable range which concerns on each Example of this invention, a rolling ball, and the surface of a receiving part. It is a figure which shows a contact when a shift lens is evacuated out of the shake correction movable range in each Example of this invention. 6 is a flowchart illustrating a shake correction operation and a procedure for retracting the shift lens out of the shake correction range according to the first embodiment of the present invention. 10 is a flowchart illustrating a shake correction operation and a procedure for retracting the shift lens out of the shake correction range according to the second embodiment of the present invention. 14 is a flowchart illustrating a shake correction operation according to Example 3 of the present invention and a procedure for retracting the shift lens out of the shake correction range. 10 is a flowchart illustrating a shake correction operation and a procedure for retracting the shift lens out of a shake correction range according to Embodiment 4 of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 103 Shift lens 104 Shift lens drive control part 114 Attitude information control part 117 Operation part 119 Control part 201 Pitch direction shake sensor 202 Yaw direction shake sensor 203 Anti-vibration control part 204 Anti-vibration control part 205 PID part 206 PID part 207 Drive part 208 Drive unit 209 Hall element 210 Hall element 211 Attitude detection unit 302 Deviation calculation unit 303 Proportional control unit 304 Differential control unit 305 Integration control unit 306 Sum calculation unit 407 Rolling ball 416 Shift lens holder 428 Receiving unit

Claims (9)

Holding means for holding the correction means to correct image blur by deflecting the optical axis,
And fixing means for supporting said holding means moves capable,
It is held between the holding means and the fixing means, and when the holding means moves relative to the fixing means, it rolls within a receiving portion formed on at least one of the holding means and the fixing means. A moving ball member;
Driving means for driving dynamic pre Symbol holding means,
According to the state of the imaging device, shake correction power stop means for stopping power supply to the drive means ,
When the power supply to the drive unit is stopped by the shake correction power supply stop unit , the holding unit is driven and the ball member is moved into the receiving portion immediately before the power supply to the drive unit is stopped. An image blur correction apparatus comprising a retraction control means for retreating out of a shake correction movable range. Holding means for holding correction means for correcting image blur by deflecting the optical axis;
Fixing means for movably supporting the holding means;
It is held between the holding means and the fixing means, and when the holding means moves relative to the fixing means, it rolls within a receiving portion formed on at least one of the holding means and the fixing means. A moving ball member;
Driving means for driving the holding means;
According to the state of the imaging device, shake correction power stop means for stopping power supply to the drive means,
When the operation member included in the imaging device has not been operated for a certain time since the last operation, the operation member is not operated for a certain time since the last operation, thereby driving the holding means to An image blur correction apparatus comprising: a retraction control unit that retreats a spherical member out of a shake correction movable range in the receiving portion. 3. The image blur correction apparatus according to claim 1, wherein the shake correction power supply stopping unit stops power supply to the drive unit according to an operation state during reproduction. Holding means for holding correction means for correcting image blur by deflecting the optical axis;
Fixing means for movably supporting the holding means;
It is held between the holding means and the fixing means, and when the holding means moves relative to the fixing means, it rolls within a receiving portion formed on at least one of the holding means and the fixing means. A moving ball member;
Driving means for driving the holding means;
When the power supply of the imaging apparatus is shut off, the retraction control means that drives the holding means to retract the ball member out of the shake correction movable range in the receiving portion immediately before the power supply of the imaging apparatus is shut off. An image blur correction apparatus comprising: Holding means for holding correction means for correcting image blur by deflecting the optical axis;
Fixing means for movably supporting the holding means;
It is held between the holding means and the fixing means, and when the holding means moves relative to the fixing means, it rolls within a receiving portion formed on at least one of the holding means and the fixing means. A moving ball member;
Driving means for driving the holding means;
When the shake signal from the shake detection means for detecting the shake of the imaging device shows a value that is equal to or greater than a threshold value for a certain time, the shake signal indicates a value that is equal to or greater than the threshold value for a certain time. Accordingly, the image blur correction apparatus includes: a retraction control unit that drives the holding unit to retreat the ball member out of a shake correction movable range in the receiving portion. As an operation for initializing the driving of the holding unit, the ball member is temporarily moved by shifting the holding unit larger than the shake correction movable range at least in the biaxial direction in which the driving unit generates a driving force. 6. The image blur correction device according to claim 1, wherein the ball member is bumped against the wall surface of the receiving portion and then shifted in a reverse direction by a predetermined amount to separate the ball member from the wall surface of the receiving portion. The image blur correction apparatus according to claim 1, wherein the shake correction possible range is a range in which optical performance is guaranteed. An optical apparatus comprising the image blur correction device according to claim 1. An imaging apparatus comprising the image blur correction apparatus according to claim 1.

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